375 lines
15 KiB
Python
375 lines
15 KiB
Python
from __future__ import absolute_import
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from django.core.exceptions import ValidationError
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from django.forms import Form
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from django.forms.fields import IntegerField, BooleanField
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from django.forms.util import ErrorList
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from django.forms.widgets import Media, HiddenInput
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from django.utils.encoding import StrAndUnicode
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from django.utils.safestring import mark_safe
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from django.utils.translation import ugettext as _
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__all__ = ('BaseFormSet', 'all_valid')
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# special field names
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TOTAL_FORM_COUNT = 'TOTAL_FORMS'
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INITIAL_FORM_COUNT = 'INITIAL_FORMS'
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MAX_NUM_FORM_COUNT = 'MAX_NUM_FORMS'
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ORDERING_FIELD_NAME = 'ORDER'
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DELETION_FIELD_NAME = 'DELETE'
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class ManagementForm(Form):
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"""
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``ManagementForm`` is used to keep track of how many form instances
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are displayed on the page. If adding new forms via javascript, you should
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increment the count field of this form as well.
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"""
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def __init__(self, *args, **kwargs):
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self.base_fields[TOTAL_FORM_COUNT] = IntegerField(widget=HiddenInput)
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self.base_fields[INITIAL_FORM_COUNT] = IntegerField(widget=HiddenInput)
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self.base_fields[MAX_NUM_FORM_COUNT] = IntegerField(required=False, widget=HiddenInput)
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super(ManagementForm, self).__init__(*args, **kwargs)
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class BaseFormSet(StrAndUnicode):
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"""
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A collection of instances of the same Form class.
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"""
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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):
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self.is_bound = data is not None or files is not None
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self.prefix = prefix or self.get_default_prefix()
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self.auto_id = auto_id
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self.data = data or {}
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self.files = files or {}
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self.initial = initial
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self.error_class = error_class
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self._errors = None
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self._non_form_errors = None
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# construct the forms in the formset
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self._construct_forms()
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def __unicode__(self):
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return self.as_table()
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def __iter__(self):
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"""Yields the forms in the order they should be rendered"""
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return iter(self.forms)
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def __getitem__(self, index):
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"""Returns the form at the given index, based on the rendering order"""
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return self.forms[index]
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def __len__(self):
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return len(self.forms)
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def __nonzero__(self):
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"""All formsets have a management form which is not included in the length"""
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return True
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def _management_form(self):
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"""Returns the ManagementForm instance for this FormSet."""
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if self.is_bound:
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form = ManagementForm(self.data, auto_id=self.auto_id, prefix=self.prefix)
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if not form.is_valid():
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raise ValidationError('ManagementForm data is missing or has been tampered with')
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else:
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form = ManagementForm(auto_id=self.auto_id, prefix=self.prefix, initial={
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TOTAL_FORM_COUNT: self.total_form_count(),
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INITIAL_FORM_COUNT: self.initial_form_count(),
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MAX_NUM_FORM_COUNT: self.max_num
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})
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return form
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management_form = property(_management_form)
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def total_form_count(self):
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"""Returns the total number of forms in this FormSet."""
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if self.is_bound:
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return self.management_form.cleaned_data[TOTAL_FORM_COUNT]
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else:
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initial_forms = self.initial_form_count()
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total_forms = initial_forms + self.extra
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# Allow all existing related objects/inlines to be displayed,
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# but don't allow extra beyond max_num.
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if initial_forms > self.max_num >= 0:
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total_forms = initial_forms
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elif total_forms > self.max_num >= 0:
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total_forms = self.max_num
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return total_forms
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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 self.is_bound:
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return self.management_form.cleaned_data[INITIAL_FORM_COUNT]
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else:
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# Use the length of the inital data if it's there, 0 otherwise.
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initial_forms = self.initial and len(self.initial) or 0
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if initial_forms > self.max_num >= 0:
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initial_forms = self.max_num
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return initial_forms
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def _construct_forms(self):
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# instantiate all the forms and put them in self.forms
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self.forms = []
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for i in xrange(self.total_form_count()):
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self.forms.append(self._construct_form(i))
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def _construct_form(self, i, **kwargs):
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"""
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Instantiates and returns the i-th form instance in a formset.
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"""
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defaults = {'auto_id': self.auto_id, 'prefix': self.add_prefix(i)}
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if self.is_bound:
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defaults['data'] = self.data
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defaults['files'] = self.files
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if self.initial:
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try:
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defaults['initial'] = self.initial[i]
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except IndexError:
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pass
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# Allow extra forms to be empty.
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if i >= self.initial_form_count():
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defaults['empty_permitted'] = True
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defaults.update(kwargs)
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form = self.form(**defaults)
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self.add_fields(form, i)
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return form
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def _get_initial_forms(self):
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"""Return a list of all the initial forms in this formset."""
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return self.forms[:self.initial_form_count()]
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initial_forms = property(_get_initial_forms)
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def _get_extra_forms(self):
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"""Return a list of all the extra forms in this formset."""
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return self.forms[self.initial_form_count():]
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extra_forms = property(_get_extra_forms)
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def _get_empty_form(self, **kwargs):
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defaults = {
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'auto_id': self.auto_id,
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'prefix': self.add_prefix('__prefix__'),
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'empty_permitted': True,
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}
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defaults.update(kwargs)
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form = self.form(**defaults)
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self.add_fields(form, None)
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return form
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empty_form = property(_get_empty_form)
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# Maybe this should just go away?
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def _get_cleaned_data(self):
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"""
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Returns a list of form.cleaned_data dicts for every form in self.forms.
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"""
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if not self.is_valid():
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raise AttributeError("'%s' object has no attribute 'cleaned_data'" % self.__class__.__name__)
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return [form.cleaned_data for form in self.forms]
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cleaned_data = property(_get_cleaned_data)
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def _get_deleted_forms(self):
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"""
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Returns a list of forms that have been marked for deletion. Raises an
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AttributeError if deletion is not allowed.
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"""
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if not self.is_valid() or not self.can_delete:
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raise AttributeError("'%s' object has no attribute 'deleted_forms'" % self.__class__.__name__)
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# construct _deleted_form_indexes which is just a list of form indexes
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# that have had their deletion widget set to True
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if not hasattr(self, '_deleted_form_indexes'):
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self._deleted_form_indexes = []
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for i in range(0, self.total_form_count()):
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form = self.forms[i]
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# if this is an extra form and hasn't changed, don't consider it
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if i >= self.initial_form_count() and not form.has_changed():
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continue
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if self._should_delete_form(form):
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self._deleted_form_indexes.append(i)
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return [self.forms[i] for i in self._deleted_form_indexes]
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deleted_forms = property(_get_deleted_forms)
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def _get_ordered_forms(self):
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"""
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Returns a list of form in the order specified by the incoming data.
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Raises an AttributeError if ordering is not allowed.
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"""
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if not self.is_valid() or not self.can_order:
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raise AttributeError("'%s' object has no attribute 'ordered_forms'" % self.__class__.__name__)
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# Construct _ordering, which is a list of (form_index, order_field_value)
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# tuples. After constructing this list, we'll sort it by order_field_value
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# so we have a way to get to the form indexes in the order specified
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# by the form data.
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if not hasattr(self, '_ordering'):
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self._ordering = []
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for i in range(0, self.total_form_count()):
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form = self.forms[i]
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# if this is an extra form and hasn't changed, don't consider it
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if i >= self.initial_form_count() and not form.has_changed():
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continue
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# don't add data marked for deletion to self.ordered_data
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if self.can_delete and self._should_delete_form(form):
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continue
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self._ordering.append((i, form.cleaned_data[ORDERING_FIELD_NAME]))
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# After we're done populating self._ordering, sort it.
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# A sort function to order things numerically ascending, but
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# None should be sorted below anything else. Allowing None as
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# a comparison value makes it so we can leave ordering fields
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# blank.
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def compare_ordering_key(k):
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if k[1] is None:
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return (1, 0) # +infinity, larger than any number
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return (0, k[1])
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self._ordering.sort(key=compare_ordering_key)
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# Return a list of form.cleaned_data dicts in the order specified by
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# the form data.
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return [self.forms[i[0]] for i in self._ordering]
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ordered_forms = property(_get_ordered_forms)
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@classmethod
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def get_default_prefix(cls):
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return 'form'
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def non_form_errors(self):
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"""
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Returns an ErrorList of errors that aren't associated with a particular
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form -- i.e., from formset.clean(). Returns an empty ErrorList if there
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are none.
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"""
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if self._non_form_errors is not None:
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return self._non_form_errors
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return self.error_class()
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def _get_errors(self):
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"""
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Returns a list of form.errors for every form in self.forms.
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"""
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if self._errors is None:
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self.full_clean()
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return self._errors
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errors = property(_get_errors)
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def _should_delete_form(self, form):
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# The way we lookup the value of the deletion field here takes
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# more code than we'd like, but the form's cleaned_data will
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# not exist if the form is invalid.
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field = form.fields[DELETION_FIELD_NAME]
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raw_value = form._raw_value(DELETION_FIELD_NAME)
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should_delete = field.clean(raw_value)
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return should_delete
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def is_valid(self):
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"""
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Returns True if form.errors is empty for every form in self.forms.
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"""
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if not self.is_bound:
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return False
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# We loop over every form.errors here rather than short circuiting on the
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# first failure to make sure validation gets triggered for every form.
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forms_valid = True
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err = self.errors
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for i in range(0, self.total_form_count()):
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form = self.forms[i]
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if self.can_delete:
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if self._should_delete_form(form):
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# This form is going to be deleted so any of its errors
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# should not cause the entire formset to be invalid.
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continue
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if bool(self.errors[i]):
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forms_valid = False
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return forms_valid and not bool(self.non_form_errors())
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def full_clean(self):
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"""
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Cleans all of self.data and populates self._errors.
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"""
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self._errors = []
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if not self.is_bound: # Stop further processing.
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return
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for i in range(0, self.total_form_count()):
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form = self.forms[i]
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self._errors.append(form.errors)
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# Give self.clean() a chance to do cross-form validation.
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try:
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self.clean()
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except ValidationError, e:
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self._non_form_errors = self.error_class(e.messages)
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def clean(self):
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"""
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Hook for doing any extra formset-wide cleaning after Form.clean() has
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been called on every form. Any ValidationError raised by this method
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will not be associated with a particular form; it will be accesible
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via formset.non_form_errors()
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"""
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pass
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def has_changed(self):
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"""
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Returns true if data in any form differs from initial.
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"""
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return any(form.has_changed() for form in self)
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def add_fields(self, form, index):
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"""A hook for adding extra fields on to each form instance."""
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if self.can_order:
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# Only pre-fill the ordering field for initial forms.
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if index is not None and index < self.initial_form_count():
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form.fields[ORDERING_FIELD_NAME] = IntegerField(label=_(u'Order'), initial=index+1, required=False)
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else:
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form.fields[ORDERING_FIELD_NAME] = IntegerField(label=_(u'Order'), required=False)
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if self.can_delete:
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form.fields[DELETION_FIELD_NAME] = BooleanField(label=_(u'Delete'), required=False)
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def add_prefix(self, index):
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return '%s-%s' % (self.prefix, index)
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def is_multipart(self):
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"""
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Returns True if the formset needs to be multipart, i.e. it
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has FileInput. Otherwise, False.
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"""
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return self.forms and self.forms[0].is_multipart()
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def _get_media(self):
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# All the forms on a FormSet are the same, so you only need to
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# interrogate the first form for media.
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if self.forms:
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return self.forms[0].media
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else:
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return Media()
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media = property(_get_media)
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def as_table(self):
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"Returns this formset rendered as HTML <tr>s -- excluding the <table></table>."
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# XXX: there is no semantic division between forms here, there
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# probably should be. It might make sense to render each form as a
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# table row with each field as a td.
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forms = u' '.join([form.as_table() for form in self])
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return mark_safe(u'\n'.join([unicode(self.management_form), forms]))
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def as_p(self):
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"Returns this formset rendered as HTML <p>s."
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forms = u' '.join([form.as_p() for form in self])
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return mark_safe(u'\n'.join([unicode(self.management_form), forms]))
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def as_ul(self):
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"Returns this formset rendered as HTML <li>s."
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forms = u' '.join([form.as_ul() for form in self])
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return mark_safe(u'\n'.join([unicode(self.management_form), forms]))
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def formset_factory(form, formset=BaseFormSet, extra=1, can_order=False,
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can_delete=False, max_num=None):
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"""Return a FormSet for the given form class."""
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attrs = {'form': form, 'extra': extra,
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'can_order': can_order, 'can_delete': can_delete,
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'max_num': max_num}
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return type(form.__name__ + 'FormSet', (formset,), attrs)
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def all_valid(formsets):
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"""Returns true if every formset in formsets is valid."""
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valid = True
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for formset in formsets:
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if not formset.is_valid():
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valid = False
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return valid
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