1428 lines
57 KiB
Python
1428 lines
57 KiB
Python
"""
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Helper functions for creating Form classes from Django models
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and database field objects.
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"""
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from itertools import chain
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from django.core.exceptions import (
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NON_FIELD_ERRORS, FieldError, ImproperlyConfigured, ValidationError,
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)
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from django.forms.fields import ChoiceField, Field
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from django.forms.forms import BaseForm, DeclarativeFieldsMetaclass
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from django.forms.formsets import BaseFormSet, formset_factory
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from django.forms.utils import ErrorList
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from django.forms.widgets import (
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HiddenInput, MultipleHiddenInput, RadioSelect, SelectMultiple,
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)
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from django.utils.text import capfirst, get_text_list
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from django.utils.translation import gettext, gettext_lazy as _
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__all__ = (
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'ModelForm', 'BaseModelForm', 'model_to_dict', 'fields_for_model',
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'ModelChoiceField', 'ModelMultipleChoiceField', 'ALL_FIELDS',
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'BaseModelFormSet', 'modelformset_factory', 'BaseInlineFormSet',
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'inlineformset_factory', 'modelform_factory',
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)
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ALL_FIELDS = '__all__'
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def construct_instance(form, instance, fields=None, exclude=None):
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"""
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Construct and return a model instance from the bound ``form``'s
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``cleaned_data``, but do not save the returned instance to the database.
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"""
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from django.db import models
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opts = instance._meta
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cleaned_data = form.cleaned_data
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file_field_list = []
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for f in opts.fields:
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if not f.editable or isinstance(f, models.AutoField) \
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or f.name not in cleaned_data:
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continue
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if fields is not None and f.name not in fields:
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continue
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if exclude and f.name in exclude:
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continue
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# Leave defaults for fields that aren't in POST data, except for
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# checkbox inputs because they don't appear in POST data if not checked.
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if (
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f.has_default() and
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form[f.name].field.widget.value_omitted_from_data(form.data, form.files, form.add_prefix(f.name)) and
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cleaned_data.get(f.name) in form[f.name].field.empty_values
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):
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continue
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# Defer saving file-type fields until after the other fields, so a
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# callable upload_to can use the values from other fields.
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if isinstance(f, models.FileField):
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file_field_list.append(f)
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else:
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f.save_form_data(instance, cleaned_data[f.name])
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for f in file_field_list:
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f.save_form_data(instance, cleaned_data[f.name])
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return instance
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# ModelForms #################################################################
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def model_to_dict(instance, fields=None, exclude=None):
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"""
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Return a dict containing the data in ``instance`` suitable for passing as
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a Form's ``initial`` keyword argument.
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``fields`` is an optional list of field names. If provided, return only the
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named.
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``exclude`` is an optional list of field names. If provided, exclude the
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named from the returned dict, even if they are listed in the ``fields``
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argument.
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"""
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opts = instance._meta
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data = {}
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for f in chain(opts.concrete_fields, opts.private_fields, opts.many_to_many):
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if not getattr(f, 'editable', False):
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continue
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if fields is not None and f.name not in fields:
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continue
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if exclude and f.name in exclude:
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continue
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data[f.name] = f.value_from_object(instance)
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return data
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def apply_limit_choices_to_to_formfield(formfield):
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"""Apply limit_choices_to to the formfield's queryset if needed."""
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from django.db.models import Exists, OuterRef, Q
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if hasattr(formfield, 'queryset') and hasattr(formfield, 'get_limit_choices_to'):
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limit_choices_to = formfield.get_limit_choices_to()
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if limit_choices_to:
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complex_filter = limit_choices_to
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if not isinstance(complex_filter, Q):
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complex_filter = Q(**limit_choices_to)
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complex_filter &= Q(pk=OuterRef('pk'))
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# Use Exists() to avoid potential duplicates.
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formfield.queryset = formfield.queryset.filter(
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Exists(formfield.queryset.model._base_manager.filter(complex_filter)),
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)
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def fields_for_model(model, fields=None, exclude=None, widgets=None,
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formfield_callback=None, localized_fields=None,
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labels=None, help_texts=None, error_messages=None,
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field_classes=None, *, apply_limit_choices_to=True):
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"""
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Return a dictionary containing form fields for the given model.
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``fields`` is an optional list of field names. If provided, return only the
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named fields.
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``exclude`` is an optional list of field names. If provided, exclude the
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named fields from the returned fields, even if they are listed in the
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``fields`` argument.
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``widgets`` is a dictionary of model field names mapped to a widget.
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``formfield_callback`` is a callable that takes a model field and returns
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a form field.
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``localized_fields`` is a list of names of fields which should be localized.
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``labels`` is a dictionary of model field names mapped to a label.
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``help_texts`` is a dictionary of model field names mapped to a help text.
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``error_messages`` is a dictionary of model field names mapped to a
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dictionary of error messages.
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``field_classes`` is a dictionary of model field names mapped to a form
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field class.
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``apply_limit_choices_to`` is a boolean indicating if limit_choices_to
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should be applied to a field's queryset.
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"""
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field_dict = {}
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ignored = []
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opts = model._meta
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# Avoid circular import
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from django.db.models import Field as ModelField
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sortable_private_fields = [f for f in opts.private_fields if isinstance(f, ModelField)]
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for f in sorted(chain(opts.concrete_fields, sortable_private_fields, opts.many_to_many)):
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if not getattr(f, 'editable', False):
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if (fields is not None and f.name in fields and
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(exclude is None or f.name not in exclude)):
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raise FieldError(
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"'%s' cannot be specified for %s model form as it is a non-editable field" % (
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f.name, model.__name__)
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)
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continue
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if fields is not None and f.name not in fields:
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continue
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if exclude and f.name in exclude:
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continue
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kwargs = {}
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if widgets and f.name in widgets:
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kwargs['widget'] = widgets[f.name]
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if localized_fields == ALL_FIELDS or (localized_fields and f.name in localized_fields):
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kwargs['localize'] = True
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if labels and f.name in labels:
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kwargs['label'] = labels[f.name]
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if help_texts and f.name in help_texts:
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kwargs['help_text'] = help_texts[f.name]
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if error_messages and f.name in error_messages:
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kwargs['error_messages'] = error_messages[f.name]
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if field_classes and f.name in field_classes:
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kwargs['form_class'] = field_classes[f.name]
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if formfield_callback is None:
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formfield = f.formfield(**kwargs)
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elif not callable(formfield_callback):
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raise TypeError('formfield_callback must be a function or callable')
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else:
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formfield = formfield_callback(f, **kwargs)
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if formfield:
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if apply_limit_choices_to:
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apply_limit_choices_to_to_formfield(formfield)
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field_dict[f.name] = formfield
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else:
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ignored.append(f.name)
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if fields:
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field_dict = {
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f: field_dict.get(f) for f in fields
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if (not exclude or f not in exclude) and f not in ignored
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}
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return field_dict
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class ModelFormOptions:
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def __init__(self, options=None):
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self.model = getattr(options, 'model', None)
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self.fields = getattr(options, 'fields', None)
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self.exclude = getattr(options, 'exclude', None)
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self.widgets = getattr(options, 'widgets', None)
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self.localized_fields = getattr(options, 'localized_fields', None)
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self.labels = getattr(options, 'labels', None)
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self.help_texts = getattr(options, 'help_texts', None)
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self.error_messages = getattr(options, 'error_messages', None)
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self.field_classes = getattr(options, 'field_classes', None)
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class ModelFormMetaclass(DeclarativeFieldsMetaclass):
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def __new__(mcs, name, bases, attrs):
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base_formfield_callback = None
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for b in bases:
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if hasattr(b, 'Meta') and hasattr(b.Meta, 'formfield_callback'):
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base_formfield_callback = b.Meta.formfield_callback
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break
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formfield_callback = attrs.pop('formfield_callback', base_formfield_callback)
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new_class = super().__new__(mcs, name, bases, attrs)
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if bases == (BaseModelForm,):
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return new_class
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opts = new_class._meta = ModelFormOptions(getattr(new_class, 'Meta', None))
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# We check if a string was passed to `fields` or `exclude`,
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# which is likely to be a mistake where the user typed ('foo') instead
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# of ('foo',)
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for opt in ['fields', 'exclude', 'localized_fields']:
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value = getattr(opts, opt)
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if isinstance(value, str) and value != ALL_FIELDS:
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msg = ("%(model)s.Meta.%(opt)s cannot be a string. "
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"Did you mean to type: ('%(value)s',)?" % {
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'model': new_class.__name__,
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'opt': opt,
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'value': value,
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})
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raise TypeError(msg)
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if opts.model:
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# If a model is defined, extract form fields from it.
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if opts.fields is None and opts.exclude is None:
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raise ImproperlyConfigured(
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"Creating a ModelForm without either the 'fields' attribute "
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"or the 'exclude' attribute is prohibited; form %s "
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"needs updating." % name
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)
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if opts.fields == ALL_FIELDS:
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# Sentinel for fields_for_model to indicate "get the list of
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# fields from the model"
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opts.fields = None
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fields = fields_for_model(
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opts.model, opts.fields, opts.exclude, opts.widgets,
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formfield_callback, opts.localized_fields, opts.labels,
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opts.help_texts, opts.error_messages, opts.field_classes,
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# limit_choices_to will be applied during ModelForm.__init__().
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apply_limit_choices_to=False,
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)
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# make sure opts.fields doesn't specify an invalid field
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none_model_fields = {k for k, v in fields.items() if not v}
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missing_fields = none_model_fields.difference(new_class.declared_fields)
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if missing_fields:
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message = 'Unknown field(s) (%s) specified for %s'
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message = message % (', '.join(missing_fields),
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opts.model.__name__)
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raise FieldError(message)
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# Override default model fields with any custom declared ones
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# (plus, include all the other declared fields).
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fields.update(new_class.declared_fields)
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else:
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fields = new_class.declared_fields
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new_class.base_fields = fields
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return new_class
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class BaseModelForm(BaseForm):
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def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
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initial=None, error_class=ErrorList, label_suffix=None,
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empty_permitted=False, instance=None, use_required_attribute=None,
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renderer=None):
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opts = self._meta
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if opts.model is None:
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raise ValueError('ModelForm has no model class specified.')
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if instance is None:
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# if we didn't get an instance, instantiate a new one
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self.instance = opts.model()
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object_data = {}
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else:
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self.instance = instance
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object_data = model_to_dict(instance, opts.fields, opts.exclude)
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# if initial was provided, it should override the values from instance
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if initial is not None:
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object_data.update(initial)
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# self._validate_unique will be set to True by BaseModelForm.clean().
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# It is False by default so overriding self.clean() and failing to call
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# super will stop validate_unique from being called.
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self._validate_unique = False
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super().__init__(
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data, files, auto_id, prefix, object_data, error_class,
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label_suffix, empty_permitted, use_required_attribute=use_required_attribute,
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renderer=renderer,
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)
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for formfield in self.fields.values():
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apply_limit_choices_to_to_formfield(formfield)
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def _get_validation_exclusions(self):
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"""
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For backwards-compatibility, exclude several types of fields from model
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validation. See tickets #12507, #12521, #12553.
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"""
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exclude = []
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# Build up a list of fields that should be excluded from model field
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# validation and unique checks.
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for f in self.instance._meta.fields:
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field = f.name
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# Exclude fields that aren't on the form. The developer may be
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# adding these values to the model after form validation.
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if field not in self.fields:
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exclude.append(f.name)
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# Don't perform model validation on fields that were defined
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# manually on the form and excluded via the ModelForm's Meta
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# class. See #12901.
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elif self._meta.fields and field not in self._meta.fields:
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exclude.append(f.name)
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elif self._meta.exclude and field in self._meta.exclude:
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exclude.append(f.name)
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# Exclude fields that failed form validation. There's no need for
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# the model fields to validate them as well.
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elif field in self._errors:
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exclude.append(f.name)
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# Exclude empty fields that are not required by the form, if the
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# underlying model field is required. This keeps the model field
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# from raising a required error. Note: don't exclude the field from
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# validation if the model field allows blanks. If it does, the blank
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# value may be included in a unique check, so cannot be excluded
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# from validation.
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else:
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form_field = self.fields[field]
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field_value = self.cleaned_data.get(field)
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if not f.blank and not form_field.required and field_value in form_field.empty_values:
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exclude.append(f.name)
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return exclude
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def clean(self):
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self._validate_unique = True
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return self.cleaned_data
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def _update_errors(self, errors):
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# Override any validation error messages defined at the model level
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# with those defined at the form level.
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opts = self._meta
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# Allow the model generated by construct_instance() to raise
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# ValidationError and have them handled in the same way as others.
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if hasattr(errors, 'error_dict'):
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error_dict = errors.error_dict
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else:
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error_dict = {NON_FIELD_ERRORS: errors}
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for field, messages in error_dict.items():
|
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if (field == NON_FIELD_ERRORS and opts.error_messages and
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NON_FIELD_ERRORS in opts.error_messages):
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error_messages = opts.error_messages[NON_FIELD_ERRORS]
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elif field in self.fields:
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error_messages = self.fields[field].error_messages
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else:
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continue
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for message in messages:
|
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if (isinstance(message, ValidationError) and
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message.code in error_messages):
|
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message.message = error_messages[message.code]
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self.add_error(None, errors)
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def _post_clean(self):
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opts = self._meta
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exclude = self._get_validation_exclusions()
|
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# Foreign Keys being used to represent inline relationships
|
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# are excluded from basic field value validation. This is for two
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# reasons: firstly, the value may not be supplied (#12507; the
|
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# case of providing new values to the admin); secondly the
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# object being referred to may not yet fully exist (#12749).
|
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# However, these fields *must* be included in uniqueness checks,
|
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# so this can't be part of _get_validation_exclusions().
|
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for name, field in self.fields.items():
|
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if isinstance(field, InlineForeignKeyField):
|
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exclude.append(name)
|
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|
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try:
|
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self.instance = construct_instance(self, self.instance, opts.fields, opts.exclude)
|
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except ValidationError as e:
|
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self._update_errors(e)
|
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|
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try:
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self.instance.full_clean(exclude=exclude, validate_unique=False)
|
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except ValidationError as e:
|
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self._update_errors(e)
|
|
|
|
# Validate uniqueness if needed.
|
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if self._validate_unique:
|
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self.validate_unique()
|
|
|
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def validate_unique(self):
|
|
"""
|
|
Call the instance's validate_unique() method and update the form's
|
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validation errors if any were raised.
|
|
"""
|
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exclude = self._get_validation_exclusions()
|
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try:
|
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self.instance.validate_unique(exclude=exclude)
|
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except ValidationError as e:
|
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self._update_errors(e)
|
|
|
|
def _save_m2m(self):
|
|
"""
|
|
Save the many-to-many fields and generic relations for this form.
|
|
"""
|
|
cleaned_data = self.cleaned_data
|
|
exclude = self._meta.exclude
|
|
fields = self._meta.fields
|
|
opts = self.instance._meta
|
|
# Note that for historical reasons we want to include also
|
|
# private_fields here. (GenericRelation was previously a fake
|
|
# m2m field).
|
|
for f in chain(opts.many_to_many, opts.private_fields):
|
|
if not hasattr(f, 'save_form_data'):
|
|
continue
|
|
if fields and f.name not in fields:
|
|
continue
|
|
if exclude and f.name in exclude:
|
|
continue
|
|
if f.name in cleaned_data:
|
|
f.save_form_data(self.instance, cleaned_data[f.name])
|
|
|
|
def save(self, commit=True):
|
|
"""
|
|
Save this form's self.instance object if commit=True. Otherwise, add
|
|
a save_m2m() method to the form which can be called after the instance
|
|
is saved manually at a later time. Return the model instance.
|
|
"""
|
|
if self.errors:
|
|
raise ValueError(
|
|
"The %s could not be %s because the data didn't validate." % (
|
|
self.instance._meta.object_name,
|
|
'created' if self.instance._state.adding else 'changed',
|
|
)
|
|
)
|
|
if commit:
|
|
# If committing, save the instance and the m2m data immediately.
|
|
self.instance.save()
|
|
self._save_m2m()
|
|
else:
|
|
# If not committing, add a method to the form to allow deferred
|
|
# saving of m2m data.
|
|
self.save_m2m = self._save_m2m
|
|
return self.instance
|
|
|
|
save.alters_data = True
|
|
|
|
|
|
class ModelForm(BaseModelForm, metaclass=ModelFormMetaclass):
|
|
pass
|
|
|
|
|
|
def modelform_factory(model, form=ModelForm, fields=None, exclude=None,
|
|
formfield_callback=None, widgets=None, localized_fields=None,
|
|
labels=None, help_texts=None, error_messages=None,
|
|
field_classes=None):
|
|
"""
|
|
Return a ModelForm containing form fields for the given model. You can
|
|
optionally pass a `form` argument to use as a starting point for
|
|
constructing the ModelForm.
|
|
|
|
``fields`` is an optional list of field names. If provided, include only
|
|
the named fields in the returned fields. If omitted or '__all__', use all
|
|
fields.
|
|
|
|
``exclude`` is an optional list of field names. If provided, exclude the
|
|
named fields from the returned fields, even if they are listed in the
|
|
``fields`` argument.
|
|
|
|
``widgets`` is a dictionary of model field names mapped to a widget.
|
|
|
|
``localized_fields`` is a list of names of fields which should be localized.
|
|
|
|
``formfield_callback`` is a callable that takes a model field and returns
|
|
a form field.
|
|
|
|
``labels`` is a dictionary of model field names mapped to a label.
|
|
|
|
``help_texts`` is a dictionary of model field names mapped to a help text.
|
|
|
|
``error_messages`` is a dictionary of model field names mapped to a
|
|
dictionary of error messages.
|
|
|
|
``field_classes`` is a dictionary of model field names mapped to a form
|
|
field class.
|
|
"""
|
|
# Create the inner Meta class. FIXME: ideally, we should be able to
|
|
# construct a ModelForm without creating and passing in a temporary
|
|
# inner class.
|
|
|
|
# Build up a list of attributes that the Meta object will have.
|
|
attrs = {'model': model}
|
|
if fields is not None:
|
|
attrs['fields'] = fields
|
|
if exclude is not None:
|
|
attrs['exclude'] = exclude
|
|
if widgets is not None:
|
|
attrs['widgets'] = widgets
|
|
if localized_fields is not None:
|
|
attrs['localized_fields'] = localized_fields
|
|
if labels is not None:
|
|
attrs['labels'] = labels
|
|
if help_texts is not None:
|
|
attrs['help_texts'] = help_texts
|
|
if error_messages is not None:
|
|
attrs['error_messages'] = error_messages
|
|
if field_classes is not None:
|
|
attrs['field_classes'] = field_classes
|
|
|
|
# If parent form class already has an inner Meta, the Meta we're
|
|
# creating needs to inherit from the parent's inner meta.
|
|
bases = (form.Meta,) if hasattr(form, 'Meta') else ()
|
|
Meta = type('Meta', bases, attrs)
|
|
if formfield_callback:
|
|
Meta.formfield_callback = staticmethod(formfield_callback)
|
|
# Give this new form class a reasonable name.
|
|
class_name = model.__name__ + 'Form'
|
|
|
|
# Class attributes for the new form class.
|
|
form_class_attrs = {
|
|
'Meta': Meta,
|
|
'formfield_callback': formfield_callback
|
|
}
|
|
|
|
if (getattr(Meta, 'fields', None) is None and
|
|
getattr(Meta, 'exclude', None) is None):
|
|
raise ImproperlyConfigured(
|
|
"Calling modelform_factory without defining 'fields' or "
|
|
"'exclude' explicitly is prohibited."
|
|
)
|
|
|
|
# Instantiate type(form) in order to use the same metaclass as form.
|
|
return type(form)(class_name, (form,), form_class_attrs)
|
|
|
|
|
|
# ModelFormSets ##############################################################
|
|
|
|
class BaseModelFormSet(BaseFormSet):
|
|
"""
|
|
A ``FormSet`` for editing a queryset and/or adding new objects to it.
|
|
"""
|
|
model = None
|
|
|
|
# Set of fields that must be unique among forms of this set.
|
|
unique_fields = set()
|
|
|
|
def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
|
|
queryset=None, *, initial=None, **kwargs):
|
|
self.queryset = queryset
|
|
self.initial_extra = initial
|
|
super().__init__(**{'data': data, 'files': files, 'auto_id': auto_id, 'prefix': prefix, **kwargs})
|
|
|
|
def initial_form_count(self):
|
|
"""Return the number of forms that are required in this FormSet."""
|
|
if not self.is_bound:
|
|
return len(self.get_queryset())
|
|
return super().initial_form_count()
|
|
|
|
def _existing_object(self, pk):
|
|
if not hasattr(self, '_object_dict'):
|
|
self._object_dict = {o.pk: o for o in self.get_queryset()}
|
|
return self._object_dict.get(pk)
|
|
|
|
def _get_to_python(self, field):
|
|
"""
|
|
If the field is a related field, fetch the concrete field's (that
|
|
is, the ultimate pointed-to field's) to_python.
|
|
"""
|
|
while field.remote_field is not None:
|
|
field = field.remote_field.get_related_field()
|
|
return field.to_python
|
|
|
|
def _construct_form(self, i, **kwargs):
|
|
pk_required = i < self.initial_form_count()
|
|
if pk_required:
|
|
if self.is_bound:
|
|
pk_key = '%s-%s' % (self.add_prefix(i), self.model._meta.pk.name)
|
|
try:
|
|
pk = self.data[pk_key]
|
|
except KeyError:
|
|
# The primary key is missing. The user may have tampered
|
|
# with POST data.
|
|
pass
|
|
else:
|
|
to_python = self._get_to_python(self.model._meta.pk)
|
|
try:
|
|
pk = to_python(pk)
|
|
except ValidationError:
|
|
# The primary key exists but is an invalid value. The
|
|
# user may have tampered with POST data.
|
|
pass
|
|
else:
|
|
kwargs['instance'] = self._existing_object(pk)
|
|
else:
|
|
kwargs['instance'] = self.get_queryset()[i]
|
|
elif self.initial_extra:
|
|
# Set initial values for extra forms
|
|
try:
|
|
kwargs['initial'] = self.initial_extra[i - self.initial_form_count()]
|
|
except IndexError:
|
|
pass
|
|
form = super()._construct_form(i, **kwargs)
|
|
if pk_required:
|
|
form.fields[self.model._meta.pk.name].required = True
|
|
return form
|
|
|
|
def get_queryset(self):
|
|
if not hasattr(self, '_queryset'):
|
|
if self.queryset is not None:
|
|
qs = self.queryset
|
|
else:
|
|
qs = self.model._default_manager.get_queryset()
|
|
|
|
# If the queryset isn't already ordered we need to add an
|
|
# artificial ordering here to make sure that all formsets
|
|
# constructed from this queryset have the same form order.
|
|
if not qs.ordered:
|
|
qs = qs.order_by(self.model._meta.pk.name)
|
|
|
|
# Removed queryset limiting here. As per discussion re: #13023
|
|
# on django-dev, max_num should not prevent existing
|
|
# related objects/inlines from being displayed.
|
|
self._queryset = qs
|
|
return self._queryset
|
|
|
|
def save_new(self, form, commit=True):
|
|
"""Save and return a new model instance for the given form."""
|
|
return form.save(commit=commit)
|
|
|
|
def save_existing(self, form, instance, commit=True):
|
|
"""Save and return an existing model instance for the given form."""
|
|
return form.save(commit=commit)
|
|
|
|
def delete_existing(self, obj, commit=True):
|
|
"""Deletes an existing model instance."""
|
|
if commit:
|
|
obj.delete()
|
|
|
|
def save(self, commit=True):
|
|
"""
|
|
Save model instances for every form, adding and changing instances
|
|
as necessary, and return the list of instances.
|
|
"""
|
|
if not commit:
|
|
self.saved_forms = []
|
|
|
|
def save_m2m():
|
|
for form in self.saved_forms:
|
|
form.save_m2m()
|
|
self.save_m2m = save_m2m
|
|
return self.save_existing_objects(commit) + self.save_new_objects(commit)
|
|
|
|
save.alters_data = True
|
|
|
|
def clean(self):
|
|
self.validate_unique()
|
|
|
|
def validate_unique(self):
|
|
# Collect unique_checks and date_checks to run from all the forms.
|
|
all_unique_checks = set()
|
|
all_date_checks = set()
|
|
forms_to_delete = self.deleted_forms
|
|
valid_forms = [form for form in self.forms if form.is_valid() and form not in forms_to_delete]
|
|
for form in valid_forms:
|
|
exclude = form._get_validation_exclusions()
|
|
unique_checks, date_checks = form.instance._get_unique_checks(exclude=exclude)
|
|
all_unique_checks.update(unique_checks)
|
|
all_date_checks.update(date_checks)
|
|
|
|
errors = []
|
|
# Do each of the unique checks (unique and unique_together)
|
|
for uclass, unique_check in all_unique_checks:
|
|
seen_data = set()
|
|
for form in valid_forms:
|
|
# Get the data for the set of fields that must be unique among the forms.
|
|
row_data = (
|
|
field if field in self.unique_fields else form.cleaned_data[field]
|
|
for field in unique_check if field in form.cleaned_data
|
|
)
|
|
# Reduce Model instances to their primary key values
|
|
row_data = tuple(
|
|
d._get_pk_val() if hasattr(d, '_get_pk_val')
|
|
# Prevent "unhashable type: list" errors later on.
|
|
else tuple(d) if isinstance(d, list)
|
|
else d for d in row_data
|
|
)
|
|
if row_data and None not in row_data:
|
|
# if we've already seen it then we have a uniqueness failure
|
|
if row_data in seen_data:
|
|
# poke error messages into the right places and mark
|
|
# the form as invalid
|
|
errors.append(self.get_unique_error_message(unique_check))
|
|
form._errors[NON_FIELD_ERRORS] = self.error_class(
|
|
[self.get_form_error()],
|
|
renderer=self.renderer,
|
|
)
|
|
# remove the data from the cleaned_data dict since it was invalid
|
|
for field in unique_check:
|
|
if field in form.cleaned_data:
|
|
del form.cleaned_data[field]
|
|
# mark the data as seen
|
|
seen_data.add(row_data)
|
|
# iterate over each of the date checks now
|
|
for date_check in all_date_checks:
|
|
seen_data = set()
|
|
uclass, lookup, field, unique_for = date_check
|
|
for form in valid_forms:
|
|
# see if we have data for both fields
|
|
if (form.cleaned_data and form.cleaned_data[field] is not None and
|
|
form.cleaned_data[unique_for] is not None):
|
|
# if it's a date lookup we need to get the data for all the fields
|
|
if lookup == 'date':
|
|
date = form.cleaned_data[unique_for]
|
|
date_data = (date.year, date.month, date.day)
|
|
# otherwise it's just the attribute on the date/datetime
|
|
# object
|
|
else:
|
|
date_data = (getattr(form.cleaned_data[unique_for], lookup),)
|
|
data = (form.cleaned_data[field],) + date_data
|
|
# if we've already seen it then we have a uniqueness failure
|
|
if data in seen_data:
|
|
# poke error messages into the right places and mark
|
|
# the form as invalid
|
|
errors.append(self.get_date_error_message(date_check))
|
|
form._errors[NON_FIELD_ERRORS] = self.error_class(
|
|
[self.get_form_error()],
|
|
renderer=self.renderer,
|
|
)
|
|
# remove the data from the cleaned_data dict since it was invalid
|
|
del form.cleaned_data[field]
|
|
# mark the data as seen
|
|
seen_data.add(data)
|
|
|
|
if errors:
|
|
raise ValidationError(errors)
|
|
|
|
def get_unique_error_message(self, unique_check):
|
|
if len(unique_check) == 1:
|
|
return gettext("Please correct the duplicate data for %(field)s.") % {
|
|
"field": unique_check[0],
|
|
}
|
|
else:
|
|
return gettext("Please correct the duplicate data for %(field)s, which must be unique.") % {
|
|
"field": get_text_list(unique_check, _("and")),
|
|
}
|
|
|
|
def get_date_error_message(self, date_check):
|
|
return gettext(
|
|
"Please correct the duplicate data for %(field_name)s "
|
|
"which must be unique for the %(lookup)s in %(date_field)s."
|
|
) % {
|
|
'field_name': date_check[2],
|
|
'date_field': date_check[3],
|
|
'lookup': str(date_check[1]),
|
|
}
|
|
|
|
def get_form_error(self):
|
|
return gettext("Please correct the duplicate values below.")
|
|
|
|
def save_existing_objects(self, commit=True):
|
|
self.changed_objects = []
|
|
self.deleted_objects = []
|
|
if not self.initial_forms:
|
|
return []
|
|
|
|
saved_instances = []
|
|
forms_to_delete = self.deleted_forms
|
|
for form in self.initial_forms:
|
|
obj = form.instance
|
|
# If the pk is None, it means either:
|
|
# 1. The object is an unexpected empty model, created by invalid
|
|
# POST data such as an object outside the formset's queryset.
|
|
# 2. The object was already deleted from the database.
|
|
if obj.pk is None:
|
|
continue
|
|
if form in forms_to_delete:
|
|
self.deleted_objects.append(obj)
|
|
self.delete_existing(obj, commit=commit)
|
|
elif form.has_changed():
|
|
self.changed_objects.append((obj, form.changed_data))
|
|
saved_instances.append(self.save_existing(form, obj, commit=commit))
|
|
if not commit:
|
|
self.saved_forms.append(form)
|
|
return saved_instances
|
|
|
|
def save_new_objects(self, commit=True):
|
|
self.new_objects = []
|
|
for form in self.extra_forms:
|
|
if not form.has_changed():
|
|
continue
|
|
# If someone has marked an add form for deletion, don't save the
|
|
# object.
|
|
if self.can_delete and self._should_delete_form(form):
|
|
continue
|
|
self.new_objects.append(self.save_new(form, commit=commit))
|
|
if not commit:
|
|
self.saved_forms.append(form)
|
|
return self.new_objects
|
|
|
|
def add_fields(self, form, index):
|
|
"""Add a hidden field for the object's primary key."""
|
|
from django.db.models import AutoField, ForeignKey, OneToOneField
|
|
self._pk_field = pk = self.model._meta.pk
|
|
# If a pk isn't editable, then it won't be on the form, so we need to
|
|
# add it here so we can tell which object is which when we get the
|
|
# data back. Generally, pk.editable should be false, but for some
|
|
# reason, auto_created pk fields and AutoField's editable attribute is
|
|
# True, so check for that as well.
|
|
|
|
def pk_is_not_editable(pk):
|
|
return (
|
|
(not pk.editable) or (pk.auto_created or isinstance(pk, AutoField)) or (
|
|
pk.remote_field and pk.remote_field.parent_link and
|
|
pk_is_not_editable(pk.remote_field.model._meta.pk)
|
|
)
|
|
)
|
|
if pk_is_not_editable(pk) or pk.name not in form.fields:
|
|
if form.is_bound:
|
|
# If we're adding the related instance, ignore its primary key
|
|
# as it could be an auto-generated default which isn't actually
|
|
# in the database.
|
|
pk_value = None if form.instance._state.adding else form.instance.pk
|
|
else:
|
|
try:
|
|
if index is not None:
|
|
pk_value = self.get_queryset()[index].pk
|
|
else:
|
|
pk_value = None
|
|
except IndexError:
|
|
pk_value = None
|
|
if isinstance(pk, (ForeignKey, OneToOneField)):
|
|
qs = pk.remote_field.model._default_manager.get_queryset()
|
|
else:
|
|
qs = self.model._default_manager.get_queryset()
|
|
qs = qs.using(form.instance._state.db)
|
|
if form._meta.widgets:
|
|
widget = form._meta.widgets.get(self._pk_field.name, HiddenInput)
|
|
else:
|
|
widget = HiddenInput
|
|
form.fields[self._pk_field.name] = ModelChoiceField(qs, initial=pk_value, required=False, widget=widget)
|
|
super().add_fields(form, index)
|
|
|
|
|
|
def modelformset_factory(model, form=ModelForm, formfield_callback=None,
|
|
formset=BaseModelFormSet, extra=1, can_delete=False,
|
|
can_order=False, max_num=None, fields=None, exclude=None,
|
|
widgets=None, validate_max=False, localized_fields=None,
|
|
labels=None, help_texts=None, error_messages=None,
|
|
min_num=None, validate_min=False, field_classes=None,
|
|
absolute_max=None, can_delete_extra=True, renderer=None):
|
|
"""Return a FormSet class for the given Django model class."""
|
|
meta = getattr(form, 'Meta', None)
|
|
if (getattr(meta, 'fields', fields) is None and
|
|
getattr(meta, 'exclude', exclude) is None):
|
|
raise ImproperlyConfigured(
|
|
"Calling modelformset_factory without defining 'fields' or "
|
|
"'exclude' explicitly is prohibited."
|
|
)
|
|
|
|
form = modelform_factory(model, form=form, fields=fields, exclude=exclude,
|
|
formfield_callback=formfield_callback,
|
|
widgets=widgets, localized_fields=localized_fields,
|
|
labels=labels, help_texts=help_texts,
|
|
error_messages=error_messages, field_classes=field_classes)
|
|
FormSet = formset_factory(form, formset, extra=extra, min_num=min_num, max_num=max_num,
|
|
can_order=can_order, can_delete=can_delete,
|
|
validate_min=validate_min, validate_max=validate_max,
|
|
absolute_max=absolute_max, can_delete_extra=can_delete_extra,
|
|
renderer=renderer)
|
|
FormSet.model = model
|
|
return FormSet
|
|
|
|
|
|
# InlineFormSets #############################################################
|
|
|
|
class BaseInlineFormSet(BaseModelFormSet):
|
|
"""A formset for child objects related to a parent."""
|
|
def __init__(self, data=None, files=None, instance=None,
|
|
save_as_new=False, prefix=None, queryset=None, **kwargs):
|
|
if instance is None:
|
|
self.instance = self.fk.remote_field.model()
|
|
else:
|
|
self.instance = instance
|
|
self.save_as_new = save_as_new
|
|
if queryset is None:
|
|
queryset = self.model._default_manager
|
|
if self.instance.pk is not None:
|
|
qs = queryset.filter(**{self.fk.name: self.instance})
|
|
else:
|
|
qs = queryset.none()
|
|
self.unique_fields = {self.fk.name}
|
|
super().__init__(data, files, prefix=prefix, queryset=qs, **kwargs)
|
|
|
|
# Add the generated field to form._meta.fields if it's defined to make
|
|
# sure validation isn't skipped on that field.
|
|
if self.form._meta.fields and self.fk.name not in self.form._meta.fields:
|
|
if isinstance(self.form._meta.fields, tuple):
|
|
self.form._meta.fields = list(self.form._meta.fields)
|
|
self.form._meta.fields.append(self.fk.name)
|
|
|
|
def initial_form_count(self):
|
|
if self.save_as_new:
|
|
return 0
|
|
return super().initial_form_count()
|
|
|
|
def _construct_form(self, i, **kwargs):
|
|
form = super()._construct_form(i, **kwargs)
|
|
if self.save_as_new:
|
|
mutable = getattr(form.data, '_mutable', None)
|
|
# Allow modifying an immutable QueryDict.
|
|
if mutable is not None:
|
|
form.data._mutable = True
|
|
# Remove the primary key from the form's data, we are only
|
|
# creating new instances
|
|
form.data[form.add_prefix(self._pk_field.name)] = None
|
|
# Remove the foreign key from the form's data
|
|
form.data[form.add_prefix(self.fk.name)] = None
|
|
if mutable is not None:
|
|
form.data._mutable = mutable
|
|
|
|
# Set the fk value here so that the form can do its validation.
|
|
fk_value = self.instance.pk
|
|
if self.fk.remote_field.field_name != self.fk.remote_field.model._meta.pk.name:
|
|
fk_value = getattr(self.instance, self.fk.remote_field.field_name)
|
|
fk_value = getattr(fk_value, 'pk', fk_value)
|
|
setattr(form.instance, self.fk.get_attname(), fk_value)
|
|
return form
|
|
|
|
@classmethod
|
|
def get_default_prefix(cls):
|
|
return cls.fk.remote_field.get_accessor_name(model=cls.model).replace('+', '')
|
|
|
|
def save_new(self, form, commit=True):
|
|
# Ensure the latest copy of the related instance is present on each
|
|
# form (it may have been saved after the formset was originally
|
|
# instantiated).
|
|
setattr(form.instance, self.fk.name, self.instance)
|
|
return super().save_new(form, commit=commit)
|
|
|
|
def add_fields(self, form, index):
|
|
super().add_fields(form, index)
|
|
if self._pk_field == self.fk:
|
|
name = self._pk_field.name
|
|
kwargs = {'pk_field': True}
|
|
else:
|
|
# The foreign key field might not be on the form, so we poke at the
|
|
# Model field to get the label, since we need that for error messages.
|
|
name = self.fk.name
|
|
kwargs = {
|
|
'label': getattr(form.fields.get(name), 'label', capfirst(self.fk.verbose_name))
|
|
}
|
|
|
|
# The InlineForeignKeyField assumes that the foreign key relation is
|
|
# based on the parent model's pk. If this isn't the case, set to_field
|
|
# to correctly resolve the initial form value.
|
|
if self.fk.remote_field.field_name != self.fk.remote_field.model._meta.pk.name:
|
|
kwargs['to_field'] = self.fk.remote_field.field_name
|
|
|
|
# If we're adding a new object, ignore a parent's auto-generated key
|
|
# as it will be regenerated on the save request.
|
|
if self.instance._state.adding:
|
|
if kwargs.get('to_field') is not None:
|
|
to_field = self.instance._meta.get_field(kwargs['to_field'])
|
|
else:
|
|
to_field = self.instance._meta.pk
|
|
if to_field.has_default():
|
|
setattr(self.instance, to_field.attname, None)
|
|
|
|
form.fields[name] = InlineForeignKeyField(self.instance, **kwargs)
|
|
|
|
def get_unique_error_message(self, unique_check):
|
|
unique_check = [field for field in unique_check if field != self.fk.name]
|
|
return super().get_unique_error_message(unique_check)
|
|
|
|
|
|
def _get_foreign_key(parent_model, model, fk_name=None, can_fail=False):
|
|
"""
|
|
Find and return the ForeignKey from model to parent if there is one
|
|
(return None if can_fail is True and no such field exists). If fk_name is
|
|
provided, assume it is the name of the ForeignKey field. Unless can_fail is
|
|
True, raise an exception if there isn't a ForeignKey from model to
|
|
parent_model.
|
|
"""
|
|
# avoid circular import
|
|
from django.db.models import ForeignKey
|
|
opts = model._meta
|
|
if fk_name:
|
|
fks_to_parent = [f for f in opts.fields if f.name == fk_name]
|
|
if len(fks_to_parent) == 1:
|
|
fk = fks_to_parent[0]
|
|
parent_list = parent_model._meta.get_parent_list()
|
|
if not isinstance(fk, ForeignKey) or (
|
|
# ForeignKey to proxy models.
|
|
fk.remote_field.model._meta.proxy and
|
|
fk.remote_field.model._meta.proxy_for_model not in parent_list
|
|
) or (
|
|
# ForeignKey to concrete models.
|
|
not fk.remote_field.model._meta.proxy and
|
|
fk.remote_field.model != parent_model and
|
|
fk.remote_field.model not in parent_list
|
|
):
|
|
raise ValueError(
|
|
"fk_name '%s' is not a ForeignKey to '%s'." % (fk_name, parent_model._meta.label)
|
|
)
|
|
elif not fks_to_parent:
|
|
raise ValueError(
|
|
"'%s' has no field named '%s'." % (model._meta.label, fk_name)
|
|
)
|
|
else:
|
|
# Try to discover what the ForeignKey from model to parent_model is
|
|
parent_list = parent_model._meta.get_parent_list()
|
|
fks_to_parent = [
|
|
f for f in opts.fields
|
|
if isinstance(f, ForeignKey) and (
|
|
f.remote_field.model == parent_model or
|
|
f.remote_field.model in parent_list or (
|
|
f.remote_field.model._meta.proxy and
|
|
f.remote_field.model._meta.proxy_for_model in parent_list
|
|
)
|
|
)
|
|
]
|
|
if len(fks_to_parent) == 1:
|
|
fk = fks_to_parent[0]
|
|
elif not fks_to_parent:
|
|
if can_fail:
|
|
return
|
|
raise ValueError(
|
|
"'%s' has no ForeignKey to '%s'." % (
|
|
model._meta.label,
|
|
parent_model._meta.label,
|
|
)
|
|
)
|
|
else:
|
|
raise ValueError(
|
|
"'%s' has more than one ForeignKey to '%s'. You must specify "
|
|
"a 'fk_name' attribute." % (
|
|
model._meta.label,
|
|
parent_model._meta.label,
|
|
)
|
|
)
|
|
return fk
|
|
|
|
|
|
def inlineformset_factory(parent_model, model, form=ModelForm,
|
|
formset=BaseInlineFormSet, fk_name=None,
|
|
fields=None, exclude=None, extra=3, can_order=False,
|
|
can_delete=True, max_num=None, formfield_callback=None,
|
|
widgets=None, validate_max=False, localized_fields=None,
|
|
labels=None, help_texts=None, error_messages=None,
|
|
min_num=None, validate_min=False, field_classes=None,
|
|
absolute_max=None, can_delete_extra=True, renderer=None):
|
|
"""
|
|
Return an ``InlineFormSet`` for the given kwargs.
|
|
|
|
``fk_name`` must be provided if ``model`` has more than one ``ForeignKey``
|
|
to ``parent_model``.
|
|
"""
|
|
fk = _get_foreign_key(parent_model, model, fk_name=fk_name)
|
|
# enforce a max_num=1 when the foreign key to the parent model is unique.
|
|
if fk.unique:
|
|
max_num = 1
|
|
kwargs = {
|
|
'form': form,
|
|
'formfield_callback': formfield_callback,
|
|
'formset': formset,
|
|
'extra': extra,
|
|
'can_delete': can_delete,
|
|
'can_order': can_order,
|
|
'fields': fields,
|
|
'exclude': exclude,
|
|
'min_num': min_num,
|
|
'max_num': max_num,
|
|
'widgets': widgets,
|
|
'validate_min': validate_min,
|
|
'validate_max': validate_max,
|
|
'localized_fields': localized_fields,
|
|
'labels': labels,
|
|
'help_texts': help_texts,
|
|
'error_messages': error_messages,
|
|
'field_classes': field_classes,
|
|
'absolute_max': absolute_max,
|
|
'can_delete_extra': can_delete_extra,
|
|
'renderer': renderer,
|
|
}
|
|
FormSet = modelformset_factory(model, **kwargs)
|
|
FormSet.fk = fk
|
|
return FormSet
|
|
|
|
|
|
# Fields #####################################################################
|
|
|
|
class InlineForeignKeyField(Field):
|
|
"""
|
|
A basic integer field that deals with validating the given value to a
|
|
given parent instance in an inline.
|
|
"""
|
|
widget = HiddenInput
|
|
default_error_messages = {
|
|
'invalid_choice': _('The inline value did not match the parent instance.'),
|
|
}
|
|
|
|
def __init__(self, parent_instance, *args, pk_field=False, to_field=None, **kwargs):
|
|
self.parent_instance = parent_instance
|
|
self.pk_field = pk_field
|
|
self.to_field = to_field
|
|
if self.parent_instance is not None:
|
|
if self.to_field:
|
|
kwargs["initial"] = getattr(self.parent_instance, self.to_field)
|
|
else:
|
|
kwargs["initial"] = self.parent_instance.pk
|
|
kwargs["required"] = False
|
|
super().__init__(*args, **kwargs)
|
|
|
|
def clean(self, value):
|
|
if value in self.empty_values:
|
|
if self.pk_field:
|
|
return None
|
|
# if there is no value act as we did before.
|
|
return self.parent_instance
|
|
# ensure the we compare the values as equal types.
|
|
if self.to_field:
|
|
orig = getattr(self.parent_instance, self.to_field)
|
|
else:
|
|
orig = self.parent_instance.pk
|
|
if str(value) != str(orig):
|
|
raise ValidationError(self.error_messages['invalid_choice'], code='invalid_choice')
|
|
return self.parent_instance
|
|
|
|
def has_changed(self, initial, data):
|
|
return False
|
|
|
|
|
|
class ModelChoiceIteratorValue:
|
|
def __init__(self, value, instance):
|
|
self.value = value
|
|
self.instance = instance
|
|
|
|
def __str__(self):
|
|
return str(self.value)
|
|
|
|
def __hash__(self):
|
|
return hash(self.value)
|
|
|
|
def __eq__(self, other):
|
|
if isinstance(other, ModelChoiceIteratorValue):
|
|
other = other.value
|
|
return self.value == other
|
|
|
|
|
|
class ModelChoiceIterator:
|
|
def __init__(self, field):
|
|
self.field = field
|
|
self.queryset = field.queryset
|
|
|
|
def __iter__(self):
|
|
if self.field.empty_label is not None:
|
|
yield ("", self.field.empty_label)
|
|
queryset = self.queryset
|
|
# Can't use iterator() when queryset uses prefetch_related()
|
|
if not queryset._prefetch_related_lookups:
|
|
queryset = queryset.iterator()
|
|
for obj in queryset:
|
|
yield self.choice(obj)
|
|
|
|
def __len__(self):
|
|
# count() adds a query but uses less memory since the QuerySet results
|
|
# won't be cached. In most cases, the choices will only be iterated on,
|
|
# and __len__() won't be called.
|
|
return self.queryset.count() + (1 if self.field.empty_label is not None else 0)
|
|
|
|
def __bool__(self):
|
|
return self.field.empty_label is not None or self.queryset.exists()
|
|
|
|
def choice(self, obj):
|
|
return (
|
|
ModelChoiceIteratorValue(self.field.prepare_value(obj), obj),
|
|
self.field.label_from_instance(obj),
|
|
)
|
|
|
|
|
|
class ModelChoiceField(ChoiceField):
|
|
"""A ChoiceField whose choices are a model QuerySet."""
|
|
# This class is a subclass of ChoiceField for purity, but it doesn't
|
|
# actually use any of ChoiceField's implementation.
|
|
default_error_messages = {
|
|
'invalid_choice': _('Select a valid choice. That choice is not one of'
|
|
' the available choices.'),
|
|
}
|
|
iterator = ModelChoiceIterator
|
|
|
|
def __init__(self, queryset, *, empty_label="---------",
|
|
required=True, widget=None, label=None, initial=None,
|
|
help_text='', to_field_name=None, limit_choices_to=None,
|
|
blank=False, **kwargs):
|
|
# Call Field instead of ChoiceField __init__() because we don't need
|
|
# ChoiceField.__init__().
|
|
Field.__init__(
|
|
self, required=required, widget=widget, label=label,
|
|
initial=initial, help_text=help_text, **kwargs
|
|
)
|
|
if (
|
|
(required and initial is not None) or
|
|
(isinstance(self.widget, RadioSelect) and not blank)
|
|
):
|
|
self.empty_label = None
|
|
else:
|
|
self.empty_label = empty_label
|
|
self.queryset = queryset
|
|
self.limit_choices_to = limit_choices_to # limit the queryset later.
|
|
self.to_field_name = to_field_name
|
|
|
|
def get_limit_choices_to(self):
|
|
"""
|
|
Return ``limit_choices_to`` for this form field.
|
|
|
|
If it is a callable, invoke it and return the result.
|
|
"""
|
|
if callable(self.limit_choices_to):
|
|
return self.limit_choices_to()
|
|
return self.limit_choices_to
|
|
|
|
def __deepcopy__(self, memo):
|
|
result = super(ChoiceField, self).__deepcopy__(memo)
|
|
# Need to force a new ModelChoiceIterator to be created, bug #11183
|
|
if self.queryset is not None:
|
|
result.queryset = self.queryset.all()
|
|
return result
|
|
|
|
def _get_queryset(self):
|
|
return self._queryset
|
|
|
|
def _set_queryset(self, queryset):
|
|
self._queryset = None if queryset is None else queryset.all()
|
|
self.widget.choices = self.choices
|
|
|
|
queryset = property(_get_queryset, _set_queryset)
|
|
|
|
# this method will be used to create object labels by the QuerySetIterator.
|
|
# Override it to customize the label.
|
|
def label_from_instance(self, obj):
|
|
"""
|
|
Convert objects into strings and generate the labels for the choices
|
|
presented by this object. Subclasses can override this method to
|
|
customize the display of the choices.
|
|
"""
|
|
return str(obj)
|
|
|
|
def _get_choices(self):
|
|
# If self._choices is set, then somebody must have manually set
|
|
# the property self.choices. In this case, just return self._choices.
|
|
if hasattr(self, '_choices'):
|
|
return self._choices
|
|
|
|
# Otherwise, execute the QuerySet in self.queryset to determine the
|
|
# choices dynamically. Return a fresh ModelChoiceIterator that has not been
|
|
# consumed. Note that we're instantiating a new ModelChoiceIterator *each*
|
|
# time _get_choices() is called (and, thus, each time self.choices is
|
|
# accessed) so that we can ensure the QuerySet has not been consumed. This
|
|
# construct might look complicated but it allows for lazy evaluation of
|
|
# the queryset.
|
|
return self.iterator(self)
|
|
|
|
choices = property(_get_choices, ChoiceField._set_choices)
|
|
|
|
def prepare_value(self, value):
|
|
if hasattr(value, '_meta'):
|
|
if self.to_field_name:
|
|
return value.serializable_value(self.to_field_name)
|
|
else:
|
|
return value.pk
|
|
return super().prepare_value(value)
|
|
|
|
def to_python(self, value):
|
|
if value in self.empty_values:
|
|
return None
|
|
try:
|
|
key = self.to_field_name or 'pk'
|
|
if isinstance(value, self.queryset.model):
|
|
value = getattr(value, key)
|
|
value = self.queryset.get(**{key: value})
|
|
except (ValueError, TypeError, self.queryset.model.DoesNotExist):
|
|
raise ValidationError(
|
|
self.error_messages['invalid_choice'],
|
|
code='invalid_choice',
|
|
params={'value': value},
|
|
)
|
|
return value
|
|
|
|
def validate(self, value):
|
|
return Field.validate(self, value)
|
|
|
|
def has_changed(self, initial, data):
|
|
if self.disabled:
|
|
return False
|
|
initial_value = initial if initial is not None else ''
|
|
data_value = data if data is not None else ''
|
|
return str(self.prepare_value(initial_value)) != str(data_value)
|
|
|
|
|
|
class ModelMultipleChoiceField(ModelChoiceField):
|
|
"""A MultipleChoiceField whose choices are a model QuerySet."""
|
|
widget = SelectMultiple
|
|
hidden_widget = MultipleHiddenInput
|
|
default_error_messages = {
|
|
'invalid_list': _('Enter a list of values.'),
|
|
'invalid_choice': _('Select a valid choice. %(value)s is not one of the'
|
|
' available choices.'),
|
|
'invalid_pk_value': _('“%(pk)s” is not a valid value.')
|
|
}
|
|
|
|
def __init__(self, queryset, **kwargs):
|
|
super().__init__(queryset, empty_label=None, **kwargs)
|
|
|
|
def to_python(self, value):
|
|
if not value:
|
|
return []
|
|
return list(self._check_values(value))
|
|
|
|
def clean(self, value):
|
|
value = self.prepare_value(value)
|
|
if self.required and not value:
|
|
raise ValidationError(self.error_messages['required'], code='required')
|
|
elif not self.required and not value:
|
|
return self.queryset.none()
|
|
if not isinstance(value, (list, tuple)):
|
|
raise ValidationError(
|
|
self.error_messages['invalid_list'],
|
|
code='invalid_list',
|
|
)
|
|
qs = self._check_values(value)
|
|
# Since this overrides the inherited ModelChoiceField.clean
|
|
# we run custom validators here
|
|
self.run_validators(value)
|
|
return qs
|
|
|
|
def _check_values(self, value):
|
|
"""
|
|
Given a list of possible PK values, return a QuerySet of the
|
|
corresponding objects. Raise a ValidationError if a given value is
|
|
invalid (not a valid PK, not in the queryset, etc.)
|
|
"""
|
|
key = self.to_field_name or 'pk'
|
|
# deduplicate given values to avoid creating many querysets or
|
|
# requiring the database backend deduplicate efficiently.
|
|
try:
|
|
value = frozenset(value)
|
|
except TypeError:
|
|
# list of lists isn't hashable, for example
|
|
raise ValidationError(
|
|
self.error_messages['invalid_list'],
|
|
code='invalid_list',
|
|
)
|
|
for pk in value:
|
|
try:
|
|
self.queryset.filter(**{key: pk})
|
|
except (ValueError, TypeError):
|
|
raise ValidationError(
|
|
self.error_messages['invalid_pk_value'],
|
|
code='invalid_pk_value',
|
|
params={'pk': pk},
|
|
)
|
|
qs = self.queryset.filter(**{'%s__in' % key: value})
|
|
pks = {str(getattr(o, key)) for o in qs}
|
|
for val in value:
|
|
if str(val) not in pks:
|
|
raise ValidationError(
|
|
self.error_messages['invalid_choice'],
|
|
code='invalid_choice',
|
|
params={'value': val},
|
|
)
|
|
return qs
|
|
|
|
def prepare_value(self, value):
|
|
if (hasattr(value, '__iter__') and
|
|
not isinstance(value, str) and
|
|
not hasattr(value, '_meta')):
|
|
prepare_value = super().prepare_value
|
|
return [prepare_value(v) for v in value]
|
|
return super().prepare_value(value)
|
|
|
|
def has_changed(self, initial, data):
|
|
if self.disabled:
|
|
return False
|
|
if initial is None:
|
|
initial = []
|
|
if data is None:
|
|
data = []
|
|
if len(initial) != len(data):
|
|
return True
|
|
initial_set = {str(value) for value in self.prepare_value(initial)}
|
|
data_set = {str(value) for value in data}
|
|
return data_set != initial_set
|
|
|
|
|
|
def modelform_defines_fields(form_class):
|
|
return hasattr(form_class, '_meta') and (
|
|
form_class._meta.fields is not None or
|
|
form_class._meta.exclude is not None
|
|
)
|