X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/16c91c1902f065c6d9b12a5c89c04d6aef620291..1422f0d2c8325b2c4d6781bd3c7b21a3d5873b90:/forms/entities.py?ds=sidebyside

diff --git a/forms/entities.py b/forms/entities.py
new file mode 100644
index 0000000..a392e45
--- /dev/null
+++ b/forms/entities.py
@@ -0,0 +1,175 @@
+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()
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