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| """ | |
| Helper functions for creating Form classes from Django models | |
| and database field objects. | |
| """ | |
| from __future__ import unicode_literals | |
| from collections import OrderedDict | |
| from itertools import chain | |
| from django.core.exceptions import ( | |
| NON_FIELD_ERRORS, FieldError, ImproperlyConfigured, ValidationError, | |
| ) | |
| from django.forms.fields import ChoiceField, Field | |
| from django.forms.forms import BaseForm, DeclarativeFieldsMetaclass | |
| from django.forms.formsets import BaseFormSet, formset_factory | |
| from django.forms.utils import ErrorList | |
| from django.forms.widgets import ( | |
| HiddenInput, MultipleHiddenInput, SelectMultiple, | |
| ) | |
| from django.utils import six | |
| from django.utils.encoding import force_text, smart_text | |
| from django.utils.text import capfirst, get_text_list | |
| from django.utils.translation import ugettext, ugettext_lazy as _ | |
| __all__ = ( | |
| 'ModelForm', 'BaseModelForm', 'model_to_dict', 'fields_for_model', | |
| 'ModelChoiceField', 'ModelMultipleChoiceField', 'ALL_FIELDS', | |
| 'BaseModelFormSet', 'modelformset_factory', 'BaseInlineFormSet', | |
| 'inlineformset_factory', 'modelform_factory', | |
| ) | |
| ALL_FIELDS = '__all__' | |
| def construct_instance(form, instance, fields=None, exclude=None): | |
| """ | |
| Constructs and returns a model instance from the bound ``form``'s | |
| ``cleaned_data``, but does not save the returned instance to the | |
| database. | |
| """ | |
| from django.db import models | |
| opts = instance._meta | |
| cleaned_data = form.cleaned_data | |
| file_field_list = [] | |
| for f in opts.fields: | |
| if not f.editable or isinstance(f, models.AutoField) \ | |
| or f.name not in cleaned_data: | |
| continue | |
| if fields is not None and f.name not in fields: | |
| continue | |
| if exclude and f.name in exclude: | |
| continue | |
| # Defer saving file-type fields until after the other fields, so a | |
| # callable upload_to can use the values from other fields. | |
| if isinstance(f, models.FileField): | |
| file_field_list.append(f) | |
| else: | |
| f.save_form_data(instance, cleaned_data[f.name]) | |
| for f in file_field_list: | |
| f.save_form_data(instance, cleaned_data[f.name]) | |
| return instance | |
| # ModelForms ################################################################# | |
| def model_to_dict(instance, fields=None, exclude=None): | |
| """ | |
| Returns a dict containing the data in ``instance`` suitable for passing as | |
| a Form's ``initial`` keyword argument. | |
| ``fields`` is an optional list of field names. If provided, only the named | |
| fields will be included in the returned dict. | |
| ``exclude`` is an optional list of field names. If provided, the named | |
| fields will be excluded from the returned dict, even if they are listed in | |
| the ``fields`` argument. | |
| """ | |
| opts = instance._meta | |
| data = {} | |
| for f in chain(opts.concrete_fields, opts.private_fields, opts.many_to_many): | |
| if not getattr(f, 'editable', False): | |
| continue | |
| if fields and f.name not in fields: | |
| continue | |
| if exclude and f.name in exclude: | |
| continue | |
| data[f.name] = f.value_from_object(instance) | |
| return data | |
| def fields_for_model(model, fields=None, exclude=None, widgets=None, | |
| formfield_callback=None, localized_fields=None, | |
| labels=None, help_texts=None, error_messages=None, | |
| field_classes=None): | |
| """ | |
| Returns a ``OrderedDict`` containing form fields for the given model. | |
| ``fields`` is an optional list of field names. If provided, only the named | |
| fields will be included in the returned fields. | |
| ``exclude`` is an optional list of field names. If provided, the named | |
| fields will be excluded 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. | |
| ``formfield_callback`` is a callable that takes a model field and returns | |
| a form field. | |
| ``localized_fields`` is a list of names of fields which should be localized. | |
| ``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. | |
| """ | |
| field_list = [] | |
| ignored = [] | |
| opts = model._meta | |
| # Avoid circular import | |
| from django.db.models.fields import Field as ModelField | |
| sortable_private_fields = [f for f in opts.private_fields if isinstance(f, ModelField)] | |
| for f in sorted(chain(opts.concrete_fields, sortable_private_fields, opts.many_to_many)): | |
| if not getattr(f, 'editable', False): | |
| if (fields is not None and f.name in fields and | |
| (exclude is None or f.name not in exclude)): | |
| raise FieldError( | |
| "'%s' cannot be specified for %s model form as it is a non-editable field" % ( | |
| f.name, model.__name__) | |
| ) | |
| continue | |
| if fields is not None and f.name not in fields: | |
| continue | |
| if exclude and f.name in exclude: | |
| continue | |
| kwargs = {} | |
| if widgets and f.name in widgets: | |
| kwargs['widget'] = widgets[f.name] | |
| if localized_fields == ALL_FIELDS or (localized_fields and f.name in localized_fields): | |
| kwargs['localize'] = True | |
| if labels and f.name in labels: | |
| kwargs['label'] = labels[f.name] | |
| if help_texts and f.name in help_texts: | |
| kwargs['help_text'] = help_texts[f.name] | |
| if error_messages and f.name in error_messages: | |
| kwargs['error_messages'] = error_messages[f.name] | |
| if field_classes and f.name in field_classes: | |
| kwargs['form_class'] = field_classes[f.name] | |
| if formfield_callback is None: | |
| formfield = f.formfield(**kwargs) | |
| elif not callable(formfield_callback): | |
| raise TypeError('formfield_callback must be a function or callable') | |
| else: | |
| formfield = formfield_callback(f, **kwargs) | |
| if formfield: | |
| field_list.append((f.name, formfield)) | |
| else: | |
| ignored.append(f.name) | |
| field_dict = OrderedDict(field_list) | |
| if fields: | |
| field_dict = OrderedDict( | |
| [(f, field_dict.get(f)) for f in fields | |
| if ((not exclude) or (exclude and f not in exclude)) and (f not in ignored)] | |
| ) | |
| return field_dict | |
| class ModelFormOptions(object): | |
| def __init__(self, options=None): | |
| self.model = getattr(options, 'model', None) | |
| self.fields = getattr(options, 'fields', None) | |
| self.exclude = getattr(options, 'exclude', None) | |
| self.widgets = getattr(options, 'widgets', None) | |
| self.localized_fields = getattr(options, 'localized_fields', None) | |
| self.labels = getattr(options, 'labels', None) | |
| self.help_texts = getattr(options, 'help_texts', None) | |
| self.error_messages = getattr(options, 'error_messages', None) | |
| self.field_classes = getattr(options, 'field_classes', None) | |
| class ModelFormMetaclass(DeclarativeFieldsMetaclass): | |
| def __new__(mcs, name, bases, attrs): | |
| base_formfield_callback = None | |
| for b in bases: | |
| if hasattr(b, 'Meta') and hasattr(b.Meta, 'formfield_callback'): | |
| base_formfield_callback = b.Meta.formfield_callback | |
| break | |
| formfield_callback = attrs.pop('formfield_callback', base_formfield_callback) | |
| new_class = super(ModelFormMetaclass, mcs).__new__(mcs, name, bases, attrs) | |
| if bases == (BaseModelForm,): | |
| return new_class | |
| opts = new_class._meta = ModelFormOptions(getattr(new_class, 'Meta', None)) | |
| # We check if a string was passed to `fields` or `exclude`, | |
| # which is likely to be a mistake where the user typed ('foo') instead | |
| # of ('foo',) | |
| for opt in ['fields', 'exclude', 'localized_fields']: | |
| value = getattr(opts, opt) | |
| if isinstance(value, six.string_types) and value != ALL_FIELDS: | |
| msg = ("%(model)s.Meta.%(opt)s cannot be a string. " | |
| "Did you mean to type: ('%(value)s',)?" % { | |
| 'model': new_class.__name__, | |
| 'opt': opt, | |
| 'value': value, | |
| }) | |
| raise TypeError(msg) | |
| if opts.model: | |
| # If a model is defined, extract form fields from it. | |
| if opts.fields is None and opts.exclude is None: | |
| raise ImproperlyConfigured( | |
| "Creating a ModelForm without either the 'fields' attribute " | |
| "or the 'exclude' attribute is prohibited; form %s " | |
| "needs updating." % name | |
| ) | |
| if opts.fields == ALL_FIELDS: | |
| # Sentinel for fields_for_model to indicate "get the list of | |
| # fields from the model" | |
| opts.fields = None | |
| fields = fields_for_model(opts.model, opts.fields, opts.exclude, | |
| opts.widgets, formfield_callback, | |
| opts.localized_fields, opts.labels, | |
| opts.help_texts, opts.error_messages, | |
| opts.field_classes) | |
| # make sure opts.fields doesn't specify an invalid field | |
| none_model_fields = [k for k, v in six.iteritems(fields) if not v] | |
| missing_fields = (set(none_model_fields) - | |
| set(new_class.declared_fields.keys())) | |
| if missing_fields: | |
| message = 'Unknown field(s) (%s) specified for %s' | |
| message = message % (', '.join(missing_fields), | |
| opts.model.__name__) | |
| raise FieldError(message) | |
| # Override default model fields with any custom declared ones | |
| # (plus, include all the other declared fields). | |
| fields.update(new_class.declared_fields) | |
| else: | |
| fields = new_class.declared_fields | |
| new_class.base_fields = fields | |
| return new_class | |
| class BaseModelForm(BaseForm): | |
| def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None, | |
| initial=None, error_class=ErrorList, label_suffix=None, | |
| empty_permitted=False, instance=None, use_required_attribute=None): | |
| opts = self._meta | |
| if opts.model is None: | |
| raise ValueError('ModelForm has no model class specified.') | |
| if instance is None: | |
| # if we didn't get an instance, instantiate a new one | |
| self.instance = opts.model() | |
| object_data = {} | |
| else: | |
| self.instance = instance | |
| object_data = model_to_dict(instance, opts.fields, opts.exclude) | |
| # if initial was provided, it should override the values from instance | |
| if initial is not None: | |
| object_data.update(initial) | |
| # self._validate_unique will be set to True by BaseModelForm.clean(). | |
| # It is False by default so overriding self.clean() and failing to call | |
| # super will stop validate_unique from being called. | |
| self._validate_unique = False | |
| super(BaseModelForm, self).__init__( | |
| data, files, auto_id, prefix, object_data, error_class, | |
| label_suffix, empty_permitted, use_required_attribute=use_required_attribute, | |
| ) | |
| # Apply ``limit_choices_to`` to each field. | |
| for field_name in self.fields: | |
| formfield = self.fields[field_name] | |
| if hasattr(formfield, 'queryset') and hasattr(formfield, 'get_limit_choices_to'): | |
| limit_choices_to = formfield.get_limit_choices_to() | |
| if limit_choices_to is not None: | |
| formfield.queryset = formfield.queryset.complex_filter(limit_choices_to) | |
| def _get_validation_exclusions(self): | |
| """ | |
| For backwards-compatibility, several types of fields need to be | |
| excluded from model validation. See the following tickets for | |
| details: #12507, #12521, #12553 | |
| """ | |
| exclude = [] | |
| # Build up a list of fields that should be excluded from model field | |
| # validation and unique checks. | |
| for f in self.instance._meta.fields: | |
| field = f.name | |
| # Exclude fields that aren't on the form. The developer may be | |
| # adding these values to the model after form validation. | |
| if field not in self.fields: | |
| exclude.append(f.name) | |
| # Don't perform model validation on fields that were defined | |
| # manually on the form and excluded via the ModelForm's Meta | |
| # class. See #12901. | |
| elif self._meta.fields and field not in self._meta.fields: | |
| exclude.append(f.name) | |
| elif self._meta.exclude and field in self._meta.exclude: | |
| exclude.append(f.name) | |
| # Exclude fields that failed form validation. There's no need for | |
| # the model fields to validate them as well. | |
| elif field in self._errors.keys(): | |
| exclude.append(f.name) | |
| # Exclude empty fields that are not required by the form, if the | |
| # underlying model field is required. This keeps the model field | |
| # from raising a required error. Note: don't exclude the field from | |
| # validation if the model field allows blanks. If it does, the blank | |
| # value may be included in a unique check, so cannot be excluded | |
| # from validation. | |
| else: | |
| form_field = self.fields[field] | |
| field_value = self.cleaned_data.get(field) | |
| if not f.blank and not form_field.required and field_value in form_field.empty_values: | |
| exclude.append(f.name) | |
| return exclude | |
| def clean(self): | |
| self._validate_unique = True | |
| return self.cleaned_data | |
| def _update_errors(self, errors): | |
| # Override any validation error messages defined at the model level | |
| # with those defined at the form level. | |
| opts = self._meta | |
| # Allow the model generated by construct_instance() to raise | |
| # ValidationError and have them handled in the same way as others. | |
| if hasattr(errors, 'error_dict'): | |
| error_dict = errors.error_dict | |
| else: | |
| error_dict = {NON_FIELD_ERRORS: errors} | |
| for field, messages in error_dict.items(): | |
| if (field == NON_FIELD_ERRORS and opts.error_messages and | |
| NON_FIELD_ERRORS in opts.error_messages): | |
| error_messages = opts.error_messages[NON_FIELD_ERRORS] | |
| elif field in self.fields: | |
| error_messages = self.fields[field].error_messages | |
| else: | |
| continue | |
| for message in messages: | |
| if (isinstance(message, ValidationError) and | |
| message.code in error_messages): | |
| message.message = error_messages[message.code] | |
| self.add_error(None, errors) | |
| def _post_clean(self): | |
| opts = self._meta | |
| exclude = self._get_validation_exclusions() | |
| # Foreign Keys being used to represent inline relationships | |
| # are excluded from basic field value validation. This is for two | |
| # reasons: firstly, the value may not be supplied (#12507; the | |
| # case of providing new values to the admin); secondly the | |
| # object being referred to may not yet fully exist (#12749). | |
| # However, these fields *must* be included in uniqueness checks, | |
| # so this can't be part of _get_validation_exclusions(). | |
| for name, field in self.fields.items(): | |
| if isinstance(field, InlineForeignKeyField): | |
| exclude.append(name) | |
| try: | |
| self.instance = construct_instance(self, self.instance, opts.fields, opts.exclude) | |
| except ValidationError as e: | |
| self._update_errors(e) | |
| try: | |
| self.instance.full_clean(exclude=exclude, validate_unique=False) | |
| except ValidationError as e: | |
| self._update_errors(e) | |
| # Validate uniqueness if needed. | |
| if self._validate_unique: | |
| self.validate_unique() | |
| def validate_unique(self): | |
| """ | |
| Calls the instance's validate_unique() method and updates the form's | |
| validation errors if any were raised. | |
| """ | |
| exclude = self._get_validation_exclusions() | |
| try: | |
| self.instance.validate_unique(exclude=exclude) | |
| except ValidationError as e: | |
| 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(six.with_metaclass(ModelFormMetaclass, BaseModelForm)): | |
| 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): | |
| """ | |
| Returns a ModelForm containing form fields for the given model. | |
| ``fields`` is an optional list of field names. If provided, only the named | |
| fields will be included in the returned fields. If omitted or '__all__', | |
| all fields will be used. | |
| ``exclude`` is an optional list of field names. If provided, the named | |
| fields will be excluded 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. | |
| parent = (object,) | |
| if hasattr(form, 'Meta'): | |
| parent = (form.Meta, object) | |
| Meta = type(str('Meta'), parent, attrs) | |
| if formfield_callback: | |
| Meta.formfield_callback = staticmethod(formfield_callback) | |
| # Give this new form class a reasonable name. | |
| class_name = model.__name__ + str('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, **kwargs): | |
| self.queryset = queryset | |
| self.initial_extra = kwargs.pop('initial', None) | |
| defaults = {'data': data, 'files': files, 'auto_id': auto_id, 'prefix': prefix} | |
| defaults.update(kwargs) | |
| super(BaseModelFormSet, self).__init__(**defaults) | |
| def initial_form_count(self): | |
| """Returns the number of forms that are required in this FormSet.""" | |
| if not (self.data or self.files): | |
| return len(self.get_queryset()) | |
| return super(BaseModelFormSet, self).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): | |
| if self.is_bound and i < self.initial_form_count(): | |
| pk_key = "%s-%s" % (self.add_prefix(i), self.model._meta.pk.name) | |
| pk = self.data[pk_key] | |
| pk_field = self.model._meta.pk | |
| to_python = self._get_to_python(pk_field) | |
| pk = to_python(pk) | |
| kwargs['instance'] = self._existing_object(pk) | |
| if i < self.initial_form_count() and 'instance' not in kwargs: | |
| kwargs['instance'] = self.get_queryset()[i] | |
| if i >= self.initial_form_count() and self.initial_extra: | |
| # Set initial values for extra forms | |
| try: | |
| kwargs['initial'] = self.initial_extra[i - self.initial_form_count()] | |
| except IndexError: | |
| pass | |
| 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_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): | |
| """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 delete_existing(self, obj, commit=True): | |
| """Deletes an existing model instance.""" | |
| if commit: | |
| obj.delete() | |
| 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) | |
| 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 = all_unique_checks.union(set(unique_checks)) | |
| all_date_checks = all_date_checks.union(set(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') 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()]) | |
| # 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()]) | |
| # 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 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, six.text_type(_("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[2], | |
| 'date_field': date_check[3], | |
| 'lookup': six.text_type(date_check[1]), | |
| } | |
| 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.initial_forms: | |
| return [] | |
| saved_instances = [] | |
| forms_to_delete = self.deleted_forms | |
| for form in self.initial_forms: | |
| obj = form.instance | |
| if form in forms_to_delete: | |
| # If the pk is None, it means that the object can't be | |
| # deleted again. Possible reason for this is that the | |
| # object was already deleted from the DB. Refs #14877. | |
| if obj.pk is None: | |
| continue | |
| 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, 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.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, OneToOneField) or isinstance(pk, ForeignKey): | |
| 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(BaseModelFormSet, self).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): | |
| """ | |
| Returns 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) | |
| 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(BaseInlineFormSet, self).__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(BaseInlineFormSet, self).initial_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 | |
| # 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) | |
| # 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.remote_field.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: | |
| 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)) | |
| } | |
| 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(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. Unless 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.remote_field.model != parent_model and | |
| fk.remote_field.model not in parent_model._meta.get_parent_list()): | |
| raise ValueError( | |
| "fk_name '%s' is not a ForeignKey to '%s'." % (fk_name, parent_model._meta.label) | |
| ) | |
| elif len(fks_to_parent) == 0: | |
| 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 | |
| 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_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 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'." % ( | |
| 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): | |
| """ | |
| 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, | |
| '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, | |
| } | |
| 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 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 | |
| super(InlineForeignKeyField, self).__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 force_text(value) != force_text(orig): | |
| raise ValidationError(self.error_messages['invalid_choice'], code='invalid_choice') | |
| return self.parent_instance | |
| def has_changed(self, initial, data): | |
| return False | |
| 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 ("", self.field.empty_label) | |
| queryset = self.queryset.all() | |
| # 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): | |
| return (len(self.queryset) + (1 if self.field.empty_label is not None else 0)) | |
| def choice(self, obj): | |
| return (self.field.prepare_value(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, | |
| *args, **kwargs): | |
| if required and (initial is not None): | |
| self.empty_label = None | |
| else: | |
| self.empty_label = empty_label | |
| # 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.limit_choices_to = limit_choices_to # limit the queryset later. | |
| self.to_field_name = to_field_name | |
| def get_limit_choices_to(self): | |
| """ | |
| Returns ``limit_choices_to`` for this form field. | |
| If it is a callable, it will be invoked and the result will be | |
| returned. | |
| """ | |
| 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 | |
| result.queryset = result.queryset | |
| return result | |
| 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_text(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(ModelChoiceField, self).prepare_value(value) | |
| def to_python(self, value): | |
| if value in self.empty_values: | |
| return None | |
| try: | |
| key = self.to_field_name or 'pk' | |
| value = self.queryset.get(**{key: value}) | |
| except (ValueError, TypeError, self.queryset.model.DoesNotExist): | |
| raise ValidationError(self.error_messages['invalid_choice'], code='invalid_choice') | |
| return value | |
| def validate(self, value): | |
| return Field.validate(self, value) | |
| def has_changed(self, initial, data): | |
| initial_value = initial if initial is not None else '' | |
| data_value = data if data is not None else '' | |
| return force_text(self.prepare_value(initial_value)) != force_text(data_value) | |
| class ModelMultipleChoiceField(ModelChoiceField): | |
| """A MultipleChoiceField whose choices are a model QuerySet.""" | |
| widget = SelectMultiple | |
| hidden_widget = MultipleHiddenInput | |
| default_error_messages = { | |
| '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 for a primary key.') | |
| } | |
| def __init__(self, queryset, required=True, widget=None, label=None, | |
| initial=None, help_text='', *args, **kwargs): | |
| super(ModelMultipleChoiceField, self).__init__( | |
| queryset, None, required, widget, label, initial, help_text, | |
| *args, **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['list'], code='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, returns a QuerySet of the | |
| corresponding objects. Raises 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['list'], | |
| code='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 = set(force_text(getattr(o, key)) for o in qs) | |
| for val in value: | |
| if force_text(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, six.text_type) and | |
| not hasattr(value, '_meta')): | |
| return [super(ModelMultipleChoiceField, self).prepare_value(v) for v in value] | |
| return super(ModelMultipleChoiceField, self).prepare_value(value) | |
| def has_changed(self, initial, data): | |
| if initial is None: | |
| initial = [] | |
| if data is None: | |
| data = [] | |
| if len(initial) != len(data): | |
| return True | |
| initial_set = set(force_text(value) for value in self.prepare_value(initial)) | |
| data_set = set(force_text(value) for value in data) | |
| return data_set != initial_set | |
| def modelform_defines_fields(form_class): | |
| return (form_class is not None and ( | |
| hasattr(form_class, '_meta') and | |
| (form_class._meta.fields is not None or | |
| form_class._meta.exclude is not None) | |
| )) |