76 lines
2.7 KiB
Python
76 lines
2.7 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 forms import BaseForm, DeclarativeFieldsMetaclass, SortedDictFromList
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__all__ = ('form_for_model', 'form_for_instance', 'form_for_fields')
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def create(self, save=True):
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"""
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Creates and returns model instance according to self.clean_data.
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This method is created for any form_for_model Form.
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"""
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if self.errors:
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raise ValueError("The %s could not be created because the data didn't validate." % self._model._meta.object_name)
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obj = self._model(**self.clean_data)
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if save:
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obj.save()
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return obj
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def make_apply_changes(opts, instance):
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"Returns the apply_changes() method for a form_for_instance Form."
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from django.db import models
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def apply_changes(self, save=True):
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if self.errors:
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raise ValueError("The %s could not be changed because the data didn't validate." % opts.object_name)
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clean_data = self.clean_data
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for f in opts.fields + opts.many_to_many:
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if isinstance(f, models.AutoField):
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continue
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setattr(instance, f.attname, clean_data[f.name])
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if save:
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instance.save()
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return instance
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return apply_changes
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def form_for_model(model, form=BaseForm):
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"""
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Returns a Form class for the given Django model class.
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Provide 'form' if you want to use a custom BaseForm subclass.
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"""
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opts = model._meta
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field_list = []
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for f in opts.fields + opts.many_to_many:
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formfield = f.formfield()
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if formfield:
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field_list.append((f.name, formfield))
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fields = SortedDictFromList(field_list)
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return type(opts.object_name + 'Form', (form,), {'fields': fields, '_model': model, 'create': create})
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def form_for_instance(instance, form=BaseForm):
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"""
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Returns a Form class for the given Django model instance.
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Provide 'form' if you want to use a custom BaseForm subclass.
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"""
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model = instance.__class__
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opts = model._meta
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field_list = []
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for f in opts.fields + opts.many_to_many:
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current_value = f.value_from_object(instance)
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formfield = f.formfield(initial=current_value)
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if formfield:
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field_list.append((f.name, formfield))
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fields = SortedDictFromList(field_list)
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return type(opts.object_name + 'InstanceForm', (form,),
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{'fields': fields, '_model': model, 'apply_changes': make_apply_changes(opts, instance)})
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def form_for_fields(field_list):
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"Returns a Form class for the given list of Django database field instances."
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fields = SortedDictFromList([(f.name, f.formfield()) for f in field_list])
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return type('FormForFields', (BaseForm,), {'fields': fields})
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