1038 lines
43 KiB
Python
1038 lines
43 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 django.db import connections
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from django.utils.encoding import smart_unicode, force_unicode
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from django.utils.datastructures import SortedDict
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from django.utils.text import get_text_list, capfirst
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from django.utils.translation import ugettext_lazy as _, ugettext
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from util import ValidationError, ErrorList
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from forms import BaseForm, get_declared_fields, NON_FIELD_ERRORS
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from fields import Field, ChoiceField, IntegerField, EMPTY_VALUES
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from widgets import Select, SelectMultiple, HiddenInput, MultipleHiddenInput
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from widgets import media_property
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from formsets import BaseFormSet, formset_factory, DELETION_FIELD_NAME
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try:
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set
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except NameError:
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from sets import Set as set # Python 2.3 fallback
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__all__ = (
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'ModelForm', 'BaseModelForm', 'model_to_dict', 'fields_for_model',
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'save_instance', 'form_for_fields', 'ModelChoiceField',
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'ModelMultipleChoiceField',
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)
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def save_instance(form, instance, fields=None, fail_message='saved',
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commit=True, exclude=None):
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"""
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Saves bound Form ``form``'s cleaned_data into model instance ``instance``.
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If commit=True, then the changes to ``instance`` will be saved to the
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database. Returns ``instance``.
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"""
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from django.db import models
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opts = instance._meta
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if form.errors:
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raise ValueError("The %s could not be %s because the data didn't"
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" validate." % (opts.object_name, fail_message))
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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 not f.name in cleaned_data:
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continue
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if fields 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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# OneToOneField doesn't allow assignment of None. Guard against that
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# instead of allowing it and throwing an error.
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if isinstance(f, models.OneToOneField) and cleaned_data[f.name] is None:
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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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# Wrap up the saving of m2m data as a function.
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def save_m2m():
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opts = instance._meta
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cleaned_data = form.cleaned_data
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for f in opts.many_to_many:
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if fields and f.name not in fields:
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continue
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if f.name in cleaned_data:
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f.save_form_data(instance, cleaned_data[f.name])
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if commit:
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# If we are committing, save the instance and the m2m data immediately.
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instance.save()
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save_m2m()
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else:
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# We're not committing. Add a method to the form to allow deferred
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# saving of m2m data.
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form.save_m2m = save_m2m
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return instance
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def make_model_save(model, fields, fail_message):
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"""Returns the save() method for a Form."""
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def save(self, commit=True):
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return save_instance(self, model(), fields, fail_message, commit)
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return save
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def make_instance_save(instance, fields, fail_message):
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"""Returns the save() method for a Form."""
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def save(self, commit=True):
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return save_instance(self, instance, fields, fail_message, commit)
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return save
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def form_for_fields(field_list):
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"""
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Returns a Form class for the given list of Django database field instances.
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"""
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fields = SortedDict([(f.name, f.formfield())
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for f in field_list if f.editable])
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return type('FormForFields', (BaseForm,), {'base_fields': fields})
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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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Returns 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, only the named
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fields will be included in the returned dict.
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``exclude`` is an optional list of field names. If provided, the named
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fields will be excluded from the returned dict, even if they are listed in
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the ``fields`` argument.
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"""
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# avoid a circular import
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from django.db.models.fields.related import ManyToManyField, OneToOneField
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opts = instance._meta
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data = {}
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for f in opts.fields + opts.many_to_many:
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if not f.editable:
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continue
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if fields and not f.name 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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if isinstance(f, ManyToManyField):
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# If the object doesn't have a primry key yet, just use an empty
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# list for its m2m fields. Calling f.value_from_object will raise
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# an exception.
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if instance.pk is None:
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data[f.name] = []
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else:
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# MultipleChoiceWidget needs a list of pks, not object instances.
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data[f.name] = [obj.pk for obj in f.value_from_object(instance)]
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else:
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data[f.name] = f.value_from_object(instance)
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return data
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def fields_for_model(model, fields=None, exclude=None, formfield_callback=lambda f: f.formfield()):
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"""
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Returns a ``SortedDict`` containing form fields for the given model.
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``fields`` is an optional list of field names. If provided, only the named
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fields will be included in the returned fields.
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``exclude`` is an optional list of field names. If provided, the named
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fields will be excluded from the returned fields, even if they are listed
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in the ``fields`` argument.
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"""
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field_list = []
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opts = model._meta
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for f in opts.fields + opts.many_to_many:
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if not f.editable:
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continue
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if fields and not f.name 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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formfield = formfield_callback(f)
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if formfield:
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field_list.append((f.name, formfield))
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field_dict = SortedDict(field_list)
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if fields:
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field_dict = SortedDict([(f, field_dict.get(f)) for f in fields if (not exclude) or (exclude and f not in exclude)])
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return field_dict
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class ModelFormOptions(object):
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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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class ModelFormMetaclass(type):
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def __new__(cls, name, bases, attrs):
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formfield_callback = attrs.pop('formfield_callback',
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lambda f: f.formfield())
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try:
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parents = [b for b in bases if issubclass(b, ModelForm)]
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except NameError:
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# We are defining ModelForm itself.
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parents = None
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declared_fields = get_declared_fields(bases, attrs, False)
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new_class = super(ModelFormMetaclass, cls).__new__(cls, name, bases,
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attrs)
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if not parents:
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return new_class
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if 'media' not in attrs:
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new_class.media = media_property(new_class)
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opts = new_class._meta = ModelFormOptions(getattr(new_class, 'Meta', None))
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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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fields = fields_for_model(opts.model, opts.fields,
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opts.exclude, formfield_callback)
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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(declared_fields)
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else:
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fields = declared_fields
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new_class.declared_fields = 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=':',
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empty_permitted=False, instance=None):
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opts = self._meta
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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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super(BaseModelForm, self).__init__(data, files, auto_id, prefix, object_data,
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error_class, label_suffix, empty_permitted)
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def clean(self):
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self.validate_unique()
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return self.cleaned_data
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def validate_unique(self):
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unique_checks, date_checks = self._get_unique_checks()
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form_errors = []
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bad_fields = set()
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field_errors, global_errors = self._perform_unique_checks(unique_checks)
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bad_fields.union(field_errors)
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form_errors.extend(global_errors)
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field_errors, global_errors = self._perform_date_checks(date_checks)
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bad_fields.union(field_errors)
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form_errors.extend(global_errors)
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for field_name in bad_fields:
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del self.cleaned_data[field_name]
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if form_errors:
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# Raise the unique together errors since they are considered
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# form-wide.
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raise ValidationError(form_errors)
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def _get_unique_checks(self):
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from django.db.models.fields import FieldDoesNotExist, Field as ModelField
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# Gather a list of checks to perform. We only perform unique checks
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# for fields present and not None in cleaned_data. Since this is a
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# ModelForm, some fields may have been excluded; we can't perform a unique
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# check on a form that is missing fields involved in that check. It also does
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# not make sense to check data that didn't validate, and since NULL does not
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# equal NULL in SQL we should not do any unique checking for NULL values.
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unique_checks = []
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# these are checks for the unique_for_<date/year/month>
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date_checks = []
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for check in self.instance._meta.unique_together[:]:
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fields_on_form = [field for field in check if self.cleaned_data.get(field) is not None]
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if len(fields_on_form) == len(check):
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unique_checks.append(check)
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# Gather a list of checks for fields declared as unique and add them to
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# the list of checks. Again, skip empty fields and any that did not validate.
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for name in self.fields:
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try:
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f = self.instance._meta.get_field_by_name(name)[0]
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except FieldDoesNotExist:
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# This is an extra field that's not on the ModelForm, ignore it
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continue
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if not isinstance(f, ModelField):
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# This is an extra field that happens to have a name that matches,
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# for example, a related object accessor for this model. So
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# get_field_by_name found it, but it is not a Field so do not proceed
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# to use it as if it were.
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continue
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if self.cleaned_data.get(name) is None:
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continue
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if f.unique:
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unique_checks.append((name,))
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if f.unique_for_date and self.cleaned_data.get(f.unique_for_date) is not None:
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date_checks.append(('date', name, f.unique_for_date))
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if f.unique_for_year and self.cleaned_data.get(f.unique_for_year) is not None:
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date_checks.append(('year', name, f.unique_for_year))
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if f.unique_for_month and self.cleaned_data.get(f.unique_for_month) is not None:
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date_checks.append(('month', name, f.unique_for_month))
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return unique_checks, date_checks
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def _perform_unique_checks(self, unique_checks):
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bad_fields = set()
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form_errors = []
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for unique_check in unique_checks:
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# Try to look up an existing object with the same values as this
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# object's values for all the unique field.
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lookup_kwargs = {}
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for field_name in unique_check:
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lookup_value = self.cleaned_data[field_name]
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# ModelChoiceField will return an object instance rather than
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# a raw primary key value, so convert it to a pk value before
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# using it in a lookup.
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if isinstance(self.fields[field_name], ModelChoiceField):
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lookup_value = lookup_value.pk
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lookup_kwargs[str(field_name)] = lookup_value
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qs = self.instance.__class__._default_manager.filter(**lookup_kwargs)
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# Exclude the current object from the query if we are editing an
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# instance (as opposed to creating a new one)
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if self.instance.pk is not None:
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qs = qs.exclude(pk=self.instance.pk)
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if qs.exists():
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if len(unique_check) == 1:
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self._errors[unique_check[0]] = ErrorList([self.unique_error_message(unique_check)])
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else:
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form_errors.append(self.unique_error_message(unique_check))
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# Mark these fields as needing to be removed from cleaned data
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# later.
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for field_name in unique_check:
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bad_fields.add(field_name)
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return bad_fields, form_errors
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def _perform_date_checks(self, date_checks):
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bad_fields = set()
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for lookup_type, field, unique_for in date_checks:
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lookup_kwargs = {}
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# there's a ticket to add a date lookup, we can remove this special
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# case if that makes it's way in
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if lookup_type == 'date':
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date = self.cleaned_data[unique_for]
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lookup_kwargs['%s__day' % unique_for] = date.day
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lookup_kwargs['%s__month' % unique_for] = date.month
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lookup_kwargs['%s__year' % unique_for] = date.year
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else:
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lookup_kwargs['%s__%s' % (unique_for, lookup_type)] = getattr(self.cleaned_data[unique_for], lookup_type)
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lookup_kwargs[field] = self.cleaned_data[field]
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qs = self.instance.__class__._default_manager.filter(**lookup_kwargs)
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# Exclude the current object from the query if we are editing an
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# instance (as opposed to creating a new one)
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if self.instance.pk is not None:
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qs = qs.exclude(pk=self.instance.pk)
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if qs.exists():
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self._errors[field] = ErrorList([
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self.date_error_message(lookup_type, field, unique_for)
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])
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bad_fields.add(field)
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return bad_fields, []
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def date_error_message(self, lookup_type, field, unique_for):
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return _(u"%(field_name)s must be unique for %(date_field)s %(lookup)s.") % {
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'field_name': unicode(self.fields[field].label),
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'date_field': unicode(self.fields[unique_for].label),
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'lookup': lookup_type,
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}
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def unique_error_message(self, unique_check):
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model_name = capfirst(self.instance._meta.verbose_name)
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# A unique field
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if len(unique_check) == 1:
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field_name = unique_check[0]
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field_label = self.fields[field_name].label
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# Insert the error into the error dict, very sneaky
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return _(u"%(model_name)s with this %(field_label)s already exists.") % {
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'model_name': unicode(model_name),
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'field_label': unicode(field_label)
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}
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# unique_together
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else:
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field_labels = [self.fields[field_name].label for field_name in unique_check]
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field_labels = get_text_list(field_labels, _('and'))
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return _(u"%(model_name)s with this %(field_label)s already exists.") % {
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'model_name': unicode(model_name),
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'field_label': unicode(field_labels)
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}
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def save(self, commit=True):
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"""
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Saves this ``form``'s cleaned_data into model instance
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``self.instance``.
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If commit=True, then the changes to ``instance`` will be saved to the
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database. Returns ``instance``.
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"""
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if self.instance.pk is None:
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fail_message = 'created'
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else:
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fail_message = 'changed'
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return save_instance(self, self.instance, self._meta.fields,
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fail_message, commit, exclude=self._meta.exclude)
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save.alters_data = True
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class ModelForm(BaseModelForm):
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__metaclass__ = ModelFormMetaclass
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def modelform_factory(model, form=ModelForm, fields=None, exclude=None,
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formfield_callback=lambda f: f.formfield()):
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# Create the inner Meta class. FIXME: ideally, we should be able to
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# construct a ModelForm without creating and passing in a temporary
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# inner class.
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# Build up a list of attributes that the Meta object will have.
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attrs = {'model': model}
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if fields is not None:
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attrs['fields'] = fields
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if exclude is not None:
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attrs['exclude'] = exclude
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# If parent form class already has an inner Meta, the Meta we're
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# creating needs to inherit from the parent's inner meta.
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parent = (object,)
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if hasattr(form, 'Meta'):
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parent = (form.Meta, object)
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Meta = type('Meta', parent, attrs)
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# Give this new form class a reasonable name.
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class_name = model.__name__ + 'Form'
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# Class attributes for the new form class.
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form_class_attrs = {
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'Meta': Meta,
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'formfield_callback': formfield_callback
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}
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return ModelFormMetaclass(class_name, (form,), form_class_attrs)
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# ModelFormSets ##############################################################
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class BaseModelFormSet(BaseFormSet):
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"""
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A ``FormSet`` for editing a queryset and/or adding new objects to it.
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"""
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model = None
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def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
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queryset=None, **kwargs):
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self.queryset = queryset
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defaults = {'data': data, 'files': files, 'auto_id': auto_id, 'prefix': prefix}
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defaults.update(kwargs)
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super(BaseModelFormSet, self).__init__(**defaults)
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def initial_form_count(self):
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"""Returns the number of forms that are required in this FormSet."""
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if not (self.data or self.files):
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return len(self.get_queryset())
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return super(BaseModelFormSet, self).initial_form_count()
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def _existing_object(self, pk):
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if not hasattr(self, '_object_dict'):
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self._object_dict = dict([(o.pk, o) for o in self.get_queryset()])
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return self._object_dict.get(pk)
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def _construct_form(self, i, **kwargs):
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if self.is_bound and i < self.initial_form_count():
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pk_key = "%s-%s" % (self.add_prefix(i), self.model._meta.pk.name)
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pk = self.data[pk_key]
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pk_field = self.model._meta.pk
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pk = pk_field.get_db_prep_lookup('exact', pk,
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connection=connections[self.get_queryset().db])
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if isinstance(pk, list):
|
|
pk = pk[0]
|
|
kwargs['instance'] = self._existing_object(pk)
|
|
if i < self.initial_form_count() and not kwargs.get('instance'):
|
|
kwargs['instance'] = self.get_queryset()[i]
|
|
return super(BaseModelFormSet, self)._construct_form(i, **kwargs)
|
|
|
|
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_query_set()
|
|
|
|
# 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)
|
|
|
|
if self.max_num > 0:
|
|
self._queryset = qs[:self.max_num]
|
|
else:
|
|
self._queryset = qs
|
|
return self._queryset
|
|
|
|
def save_new(self, form, commit=True):
|
|
"""Saves and returns a new model instance for the given form."""
|
|
return form.save(commit=commit)
|
|
|
|
def save_existing(self, form, instance, commit=True):
|
|
"""Saves and returns an existing model instance for the given form."""
|
|
return form.save(commit=commit)
|
|
|
|
def save(self, commit=True):
|
|
"""Saves model instances for every form, adding and changing instances
|
|
as necessary, and returns 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)
|
|
|
|
def clean(self):
|
|
self.validate_unique()
|
|
|
|
def validate_unique(self):
|
|
# Iterate over the forms so that we can find one with potentially valid
|
|
# data from which to extract the error checks
|
|
for form in self.forms:
|
|
if hasattr(form, 'cleaned_data'):
|
|
break
|
|
else:
|
|
return
|
|
unique_checks, date_checks = form._get_unique_checks()
|
|
errors = []
|
|
# Do each of the unique checks (unique and unique_together)
|
|
for unique_check in unique_checks:
|
|
seen_data = set()
|
|
for form in self.forms:
|
|
# if the form doesn't have cleaned_data then we ignore it,
|
|
# it's already invalid
|
|
if not hasattr(form, "cleaned_data"):
|
|
continue
|
|
# get each of the fields for which we have data on this form
|
|
if [f for f in unique_check if f in form.cleaned_data and form.cleaned_data[f] is not None]:
|
|
# get the data itself
|
|
row_data = tuple([form.cleaned_data[field] for field in unique_check])
|
|
# if we've aready 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.get_form_error()
|
|
del form.cleaned_data
|
|
break
|
|
# mark the data as seen
|
|
seen_data.add(row_data)
|
|
# iterate over each of the date checks now
|
|
for date_check in date_checks:
|
|
seen_data = set()
|
|
lookup, field, unique_for = date_check
|
|
for form in self.forms:
|
|
# if the form doesn't have cleaned_data then we ignore it,
|
|
# it's already invalid
|
|
if not hasattr(self, 'cleaned_data'):
|
|
continue
|
|
# 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 aready 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.get_form_error()
|
|
del form.cleaned_data
|
|
break
|
|
seen_data.add(data)
|
|
if errors:
|
|
raise ValidationError(errors)
|
|
|
|
def get_unique_error_message(self, unique_check):
|
|
if len(unique_check) == 1:
|
|
return ugettext("Please correct the duplicate data for %(field)s.") % {
|
|
"field": unique_check[0],
|
|
}
|
|
else:
|
|
return ugettext("Please correct the duplicate data for %(field)s, "
|
|
"which must be unique.") % {
|
|
"field": get_text_list(unique_check, unicode(_("and"))),
|
|
}
|
|
|
|
def get_date_error_message(self, date_check):
|
|
return ugettext("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[1],
|
|
'date_field': date_check[2],
|
|
'lookup': unicode(date_check[0]),
|
|
}
|
|
|
|
def get_form_error(self):
|
|
return ugettext("Please correct the duplicate values below.")
|
|
|
|
def save_existing_objects(self, commit=True):
|
|
self.changed_objects = []
|
|
self.deleted_objects = []
|
|
if not self.get_queryset():
|
|
return []
|
|
|
|
saved_instances = []
|
|
for form in self.initial_forms:
|
|
pk_name = self._pk_field.name
|
|
raw_pk_value = form._raw_value(pk_name)
|
|
|
|
# clean() for different types of PK fields can sometimes return
|
|
# the model instance, and sometimes the PK. Handle either.
|
|
pk_value = form.fields[pk_name].clean(raw_pk_value)
|
|
pk_value = getattr(pk_value, 'pk', pk_value)
|
|
|
|
obj = self._existing_object(pk_value)
|
|
if self.can_delete:
|
|
raw_delete_value = form._raw_value(DELETION_FIELD_NAME)
|
|
should_delete = form.fields[DELETION_FIELD_NAME].clean(raw_delete_value)
|
|
if should_delete:
|
|
self.deleted_objects.append(obj)
|
|
obj.delete()
|
|
continue
|
|
if 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:
|
|
raw_delete_value = form._raw_value(DELETION_FIELD_NAME)
|
|
should_delete = form.fields[DELETION_FIELD_NAME].clean(raw_delete_value)
|
|
if should_delete:
|
|
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, OneToOneField, ForeignKey
|
|
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.rel and pk.rel.parent_link and pk_is_not_editable(pk.rel.to._meta.pk)))
|
|
if pk_is_not_editable(pk) or pk.name not in form.fields:
|
|
if form.is_bound:
|
|
pk_value = form.instance.pk
|
|
else:
|
|
try:
|
|
pk_value = self.get_queryset()[index].pk
|
|
except IndexError:
|
|
pk_value = None
|
|
if isinstance(pk, OneToOneField) or isinstance(pk, ForeignKey):
|
|
qs = pk.rel.to._default_manager.get_query_set()
|
|
else:
|
|
qs = self.model._default_manager.get_query_set()
|
|
qs = qs.using(form.instance._state.db)
|
|
form.fields[self._pk_field.name] = ModelChoiceField(qs, initial=pk_value, required=False, widget=HiddenInput)
|
|
super(BaseModelFormSet, self).add_fields(form, index)
|
|
|
|
def modelformset_factory(model, form=ModelForm, formfield_callback=lambda f: f.formfield(),
|
|
formset=BaseModelFormSet,
|
|
extra=1, can_delete=False, can_order=False,
|
|
max_num=0, fields=None, exclude=None):
|
|
"""
|
|
Returns a FormSet class for the given Django model class.
|
|
"""
|
|
form = modelform_factory(model, form=form, fields=fields, exclude=exclude,
|
|
formfield_callback=formfield_callback)
|
|
FormSet = formset_factory(form, formset, extra=extra, max_num=max_num,
|
|
can_order=can_order, can_delete=can_delete)
|
|
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):
|
|
from django.db.models.fields.related import RelatedObject
|
|
if instance is None:
|
|
self.instance = self.fk.rel.to()
|
|
else:
|
|
self.instance = instance
|
|
self.save_as_new = save_as_new
|
|
# is there a better way to get the object descriptor?
|
|
self.rel_name = RelatedObject(self.fk.rel.to, self.model, self.fk).get_accessor_name()
|
|
if self.fk.rel.field_name == self.fk.rel.to._meta.pk.name:
|
|
backlink_value = self.instance
|
|
else:
|
|
backlink_value = getattr(self.instance, self.fk.rel.field_name)
|
|
if queryset is None:
|
|
queryset = self.model._default_manager
|
|
qs = queryset.filter(**{self.fk.name: backlink_value})
|
|
super(BaseInlineFormSet, self).__init__(data, files, prefix=prefix,
|
|
queryset=qs)
|
|
|
|
def initial_form_count(self):
|
|
if self.save_as_new:
|
|
return 0
|
|
return super(BaseInlineFormSet, self).initial_form_count()
|
|
|
|
def total_form_count(self):
|
|
if self.save_as_new:
|
|
return super(BaseInlineFormSet, self).initial_form_count()
|
|
return super(BaseInlineFormSet, self).total_form_count()
|
|
|
|
def _construct_form(self, i, **kwargs):
|
|
form = super(BaseInlineFormSet, self)._construct_form(i, **kwargs)
|
|
if self.save_as_new:
|
|
# 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
|
|
return form
|
|
|
|
#@classmethod
|
|
def get_default_prefix(cls):
|
|
from django.db.models.fields.related import RelatedObject
|
|
return RelatedObject(cls.fk.rel.to, cls.model, cls.fk).get_accessor_name()
|
|
get_default_prefix = classmethod(get_default_prefix)
|
|
|
|
def save_new(self, form, commit=True):
|
|
# Use commit=False so we can assign the parent key afterwards, then
|
|
# save the object.
|
|
obj = form.save(commit=False)
|
|
pk_value = getattr(self.instance, self.fk.rel.field_name)
|
|
setattr(obj, self.fk.get_attname(), getattr(pk_value, 'pk', pk_value))
|
|
if commit:
|
|
obj.save()
|
|
# form.save_m2m() can be called via the formset later on if commit=False
|
|
if commit and hasattr(form, 'save_m2m'):
|
|
form.save_m2m()
|
|
return obj
|
|
|
|
def add_fields(self, form, index):
|
|
super(BaseInlineFormSet, self).add_fields(form, index)
|
|
if self._pk_field == self.fk:
|
|
form.fields[self._pk_field.name] = InlineForeignKeyField(self.instance, 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.
|
|
kwargs = {
|
|
'label': getattr(form.fields.get(self.fk.name), 'label', capfirst(self.fk.verbose_name))
|
|
}
|
|
if self.fk.rel.field_name != self.fk.rel.to._meta.pk.name:
|
|
kwargs['to_field'] = self.fk.rel.field_name
|
|
form.fields[self.fk.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(BaseInlineFormSet, self).get_unique_error_message(unique_check)
|
|
|
|
def _get_foreign_key(parent_model, model, fk_name=None, can_fail=False):
|
|
"""
|
|
Finds and returns the ForeignKey from model to parent if there is one
|
|
(returns 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. Unles can_fail is
|
|
True, an exception is raised if there is no 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]
|
|
if not isinstance(fk, ForeignKey) or \
|
|
(fk.rel.to != parent_model and
|
|
fk.rel.to not in parent_model._meta.get_parent_list()):
|
|
raise Exception("fk_name '%s' is not a ForeignKey to %s" % (fk_name, parent_model))
|
|
elif len(fks_to_parent) == 0:
|
|
raise Exception("%s has no field named '%s'" % (model, fk_name))
|
|
else:
|
|
# Try to discover what the ForeignKey from model to parent_model is
|
|
fks_to_parent = [
|
|
f for f in opts.fields
|
|
if isinstance(f, ForeignKey)
|
|
and (f.rel.to == parent_model
|
|
or f.rel.to in parent_model._meta.get_parent_list())
|
|
]
|
|
if len(fks_to_parent) == 1:
|
|
fk = fks_to_parent[0]
|
|
elif len(fks_to_parent) == 0:
|
|
if can_fail:
|
|
return
|
|
raise Exception("%s has no ForeignKey to %s" % (model, parent_model))
|
|
else:
|
|
raise Exception("%s has more than 1 ForeignKey to %s" % (model, parent_model))
|
|
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=0,
|
|
formfield_callback=lambda f: f.formfield()):
|
|
"""
|
|
Returns an ``InlineFormSet`` for the given kwargs.
|
|
|
|
You must provide ``fk_name`` 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,
|
|
'max_num': max_num,
|
|
}
|
|
FormSet = modelformset_factory(model, **kwargs)
|
|
FormSet.fk = fk
|
|
return FormSet
|
|
|
|
|
|
# Fields #####################################################################
|
|
|
|
class InlineForeignKeyHiddenInput(HiddenInput):
|
|
def _has_changed(self, initial, data):
|
|
return False
|
|
|
|
class InlineForeignKeyField(Field):
|
|
"""
|
|
A basic integer field that deals with validating the given value to a
|
|
given parent instance in an inline.
|
|
"""
|
|
default_error_messages = {
|
|
'invalid_choice': _(u'The inline foreign key did not match the parent instance primary key.'),
|
|
}
|
|
|
|
def __init__(self, parent_instance, *args, **kwargs):
|
|
self.parent_instance = parent_instance
|
|
self.pk_field = kwargs.pop("pk_field", False)
|
|
self.to_field = kwargs.pop("to_field", None)
|
|
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
|
|
kwargs["widget"] = InlineForeignKeyHiddenInput
|
|
super(InlineForeignKeyField, self).__init__(*args, **kwargs)
|
|
|
|
def clean(self, value):
|
|
if value in 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 force_unicode(value) != force_unicode(orig):
|
|
raise ValidationError(self.error_messages['invalid_choice'])
|
|
return self.parent_instance
|
|
|
|
class ModelChoiceIterator(object):
|
|
def __init__(self, field):
|
|
self.field = field
|
|
self.queryset = field.queryset
|
|
|
|
def __iter__(self):
|
|
if self.field.empty_label is not None:
|
|
yield (u"", self.field.empty_label)
|
|
if self.field.cache_choices:
|
|
if self.field.choice_cache is None:
|
|
self.field.choice_cache = [
|
|
self.choice(obj) for obj in self.queryset.all()
|
|
]
|
|
for choice in self.field.choice_cache:
|
|
yield choice
|
|
else:
|
|
for obj in self.queryset.all():
|
|
yield self.choice(obj)
|
|
|
|
def __len__(self):
|
|
return len(self.queryset)
|
|
|
|
def choice(self, obj):
|
|
if self.field.to_field_name:
|
|
key = obj.serializable_value(self.field.to_field_name)
|
|
else:
|
|
key = obj.pk
|
|
return (key, 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': _(u'Select a valid choice. That choice is not one of'
|
|
u' the available choices.'),
|
|
}
|
|
|
|
def __init__(self, queryset, empty_label=u"---------", cache_choices=False,
|
|
required=True, widget=None, label=None, initial=None,
|
|
help_text=None, to_field_name=None, *args, **kwargs):
|
|
if required and (initial is not None):
|
|
self.empty_label = None
|
|
else:
|
|
self.empty_label = empty_label
|
|
self.cache_choices = cache_choices
|
|
|
|
# Call Field instead of ChoiceField __init__() because we don't need
|
|
# ChoiceField.__init__().
|
|
Field.__init__(self, required, widget, label, initial, help_text,
|
|
*args, **kwargs)
|
|
self.queryset = queryset
|
|
self.choice_cache = None
|
|
self.to_field_name = to_field_name
|
|
|
|
def _get_queryset(self):
|
|
return self._queryset
|
|
|
|
def _set_queryset(self, queryset):
|
|
self._queryset = queryset
|
|
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):
|
|
"""
|
|
This method is used to convert objects into strings; it's used to
|
|
generate the labels for the choices presented by this object. Subclasses
|
|
can override this method to customize the display of the choices.
|
|
"""
|
|
return smart_unicode(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 QuerySetIterator that has not been
|
|
# consumed. Note that we're instantiating a new QuerySetIterator *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 ModelChoiceIterator(self)
|
|
|
|
choices = property(_get_choices, ChoiceField._set_choices)
|
|
|
|
def clean(self, value):
|
|
Field.clean(self, value)
|
|
if value in EMPTY_VALUES:
|
|
return None
|
|
try:
|
|
key = self.to_field_name or 'pk'
|
|
value = self.queryset.get(**{key: value})
|
|
except self.queryset.model.DoesNotExist:
|
|
raise ValidationError(self.error_messages['invalid_choice'])
|
|
return value
|
|
|
|
class ModelMultipleChoiceField(ModelChoiceField):
|
|
"""A MultipleChoiceField whose choices are a model QuerySet."""
|
|
widget = SelectMultiple
|
|
hidden_widget = MultipleHiddenInput
|
|
default_error_messages = {
|
|
'list': _(u'Enter a list of values.'),
|
|
'invalid_choice': _(u'Select a valid choice. %s is not one of the'
|
|
u' available choices.'),
|
|
'invalid_pk_value': _(u'"%s" is not a valid value for a primary key.')
|
|
}
|
|
|
|
def __init__(self, queryset, cache_choices=False, required=True,
|
|
widget=None, label=None, initial=None,
|
|
help_text=None, *args, **kwargs):
|
|
super(ModelMultipleChoiceField, self).__init__(queryset, None,
|
|
cache_choices, required, widget, label, initial, help_text,
|
|
*args, **kwargs)
|
|
|
|
def clean(self, value):
|
|
if self.required and not value:
|
|
raise ValidationError(self.error_messages['required'])
|
|
elif not self.required and not value:
|
|
return []
|
|
if not isinstance(value, (list, tuple)):
|
|
raise ValidationError(self.error_messages['list'])
|
|
for pk in value:
|
|
try:
|
|
self.queryset.filter(pk=pk)
|
|
except ValueError:
|
|
raise ValidationError(self.error_messages['invalid_pk_value'] % pk)
|
|
qs = self.queryset.filter(pk__in=value)
|
|
pks = set([force_unicode(o.pk) for o in qs])
|
|
for val in value:
|
|
if force_unicode(val) not in pks:
|
|
raise ValidationError(self.error_messages['invalid_choice'] % val)
|
|
return qs
|