--- /dev/null
+from django import forms
+from django.contrib.contenttypes.generic import BaseGenericInlineFormSet
+from django.contrib.contenttypes.models import ContentType
+from django.forms.models import ModelFormMetaclass, ModelForm
+from django.utils.datastructures import SortedDict
+from philo.models import Attribute
+from philo.utils import fattr
+
+
+__all__ = ('EntityForm', 'AttributeForm', 'AttributeInlineFormSet')
+
+
+def proxy_fields_for_entity_model(entity_model, fields=None, exclude=None, widgets=None, formfield_callback=lambda f, **kwargs: f.formfield(**kwargs)):
+ field_list = []
+ ignored = []
+ opts = entity_model._entity_meta
+ for f in opts.proxy_fields:
+ if not f.editable:
+ continue
+ if fields and not f.name in fields:
+ continue
+ if exclude and f.name in exclude:
+ continue
+ if widgets and f.name in widgets:
+ kwargs = {'widget': widgets[f.name]}
+ else:
+ kwargs = {}
+ formfield = formfield_callback(f, **kwargs)
+ if formfield:
+ field_list.append((f.name, formfield))
+ else:
+ ignored.append(f.name)
+ field_dict = SortedDict(field_list)
+ if fields:
+ field_dict = SortedDict(
+ [(f, field_dict.get(f)) for f in fields
+ if ((not exclude) or (exclude and f not in exclude)) and (f not in ignored) and (f in field_dict)]
+ )
+ return field_dict
+
+
+# BEGIN HACK - This will not be required after http://code.djangoproject.com/ticket/14082 has been resolved
+
+class EntityFormBase(ModelForm):
+ pass
+
+_old_metaclass_new = ModelFormMetaclass.__new__
+
+def _new_metaclass_new(cls, name, bases, attrs):
+ new_class = _old_metaclass_new(cls, name, bases, attrs)
+ if issubclass(new_class, EntityFormBase) and new_class._meta.model:
+ new_class.base_fields.update(proxy_fields_for_entity_model(new_class._meta.model, new_class._meta.fields, new_class._meta.exclude, new_class._meta.widgets)) # don't pass in formfield_callback
+ return new_class
+
+ModelFormMetaclass.__new__ = staticmethod(_new_metaclass_new)
+
+# END HACK
+
+
+class EntityForm(EntityFormBase): # Would inherit from ModelForm directly if it weren't for the above HACK
+ def __init__(self, *args, **kwargs):
+ initial = kwargs.pop('initial', None)
+ instance = kwargs.get('instance', None)
+ if instance is not None:
+ new_initial = {}
+ for f in instance._entity_meta.proxy_fields:
+ if self._meta.fields and not f.name in self._meta.fields:
+ continue
+ if self._meta.exclude and f.name in self._meta.exclude:
+ continue
+ new_initial[f.name] = f.value_from_object(instance)
+ else:
+ new_initial = {}
+ if initial is not None:
+ new_initial.update(initial)
+ kwargs['initial'] = new_initial
+ super(EntityForm, self).__init__(*args, **kwargs)
+
+ @fattr(alters_data=True)
+ def save(self, commit=True):
+ cleaned_data = self.cleaned_data
+ instance = super(EntityForm, self).save(commit=False)
+
+ for f in instance._entity_meta.proxy_fields:
+ if not f.editable or not f.name in cleaned_data:
+ continue
+ if self._meta.fields and f.name not in self._meta.fields:
+ continue
+ if self._meta.exclude and f.name in self._meta.exclude:
+ continue
+ setattr(instance, f.attname, cleaned_data[f.name])
+
+ if commit:
+ instance.save()
+ self.save_m2m()
+
+ return instance
+
+
+ def apply_data(self, cleaned_data):
+ self.value = cleaned_data.get('value', None)
+
+ def apply_data(self, cleaned_data):
+ if 'value' in cleaned_data and cleaned_data['value'] is not None:
+ self.value = cleaned_data['value']
+ else:
+ self.content_type = cleaned_data.get('content_type', None)
+ # If there is no value set in the cleaned data, clear the stored value.
+ self.object_id = None
+
+ def apply_data(self, cleaned_data):
+ if 'value' in cleaned_data and cleaned_data['value'] is not None:
+ self.value = cleaned_data['value']
+ else:
+ self.content_type = cleaned_data.get('content_type', None)
+ # If there is no value set in the cleaned data, clear the stored value.
+ self.value = []
+
+class AttributeForm(ModelForm):
+ """
+ This class handles an attribute's fields as well as the fields for its value (if there is one.)
+ The fields defined will vary depending on the value type, but the fields for defining the value
+ (i.e. value_content_type and value_object_id) will always be defined. Except that value_object_id
+ will never be defined. BLARGH!
+ """
+ def __init__(self, *args, **kwargs):
+ super(AttributeForm, self).__init__(*args, **kwargs)
+
+ # This is necessary because model forms store changes to self.instance in their clean method.
+ # Mutter mutter.
+ value = self.instance.value
+ self._cached_value_ct = self.instance.value_content_type
+ self._cached_value = value
+
+ # If there is a value, pull in its fields.
+ if value is not None:
+ self.value_fields = value.value_formfields()
+ self.fields.update(self.value_fields)
+
+ def save(self, *args, **kwargs):
+ # At this point, the cleaned_data has already been stored on self.instance.
+
+ if self.instance.value_content_type != self._cached_value_ct:
+ # The value content type has changed. Clear the old value, if there was one.
+ if self._cached_value:
+ self._cached_value.delete()
+
+ # Clear the submitted value, if any.
+ self.cleaned_data.pop('value', None)
+
+ # Now create a new value instance so that on next instantiation, the form will
+ # know what fields to add.
+ if self.instance.value_content_type is not None:
+ self.instance.value = self.instance.value_content_type.model_class().objects.create()
+ elif self.instance.value is not None:
+ # The value content type is the same, but one of the value fields has changed.
+
+ # Use construct_instance to apply the changes from the cleaned_data to the value instance.
+ fields = self.value_fields.keys()
+ if set(fields) & set(self.changed_data):
+ self.instance.value.construct_instance(**dict([(key, self.cleaned_data[key]) for key in fields]))
+ self.instance.value.save()
+
+ return super(AttributeForm, self).save(*args, **kwargs)
+
+ class Meta:
+ model = Attribute
+
+
+class AttributeInlineFormSet(BaseGenericInlineFormSet):
+ "Necessary to force the GenericInlineFormset to use the form's save method for new objects."
+ def save_new(self, form, commit):
+ setattr(form.instance, self.ct_field.get_attname(), ContentType.objects.get_for_model(self.instance).pk)
+ setattr(form.instance, self.ct_fk_field.get_attname(), self.instance.pk)
+ return form.save()
\ No newline at end of file
git.ithinksw.org / philo.git / blobdiff