X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/19e0d1e6a2bb46d46b988fbad188d8dd4288bf5e..05bdd3ca32b67c218f7d58c2def2661867b4d1fa:/models/fields.py

diff --git a/models/fields.py b/models/fields.py
index 74a0525..3e43c0f 100644
--- a/models/fields.py
+++ b/models/fields.py
@@ -1,6 +1,7 @@
-from django.db import models
 from django import forms
 from django.core.exceptions import FieldError, ValidationError
+from django.db import models
+from django.db.models.fields import NOT_PROVIDED
 from django.utils import simplejson as json
 from django.utils.text import capfirst
 from philo.signals import entity_class_prepared
@@ -13,11 +14,13 @@ __all__ = ('JSONAttribute', 'ForeignKeyAttribute', 'ManyToManyAttribute')
 class EntityProxyField(object):
 	descriptor_class = None
 	
-	def __init__(self, *args, **kwargs):
+	def __init__(self, verbose_name=None, help_text=None, default=NOT_PROVIDED, editable=True, *args, **kwargs):
 		if self.descriptor_class is None:
 			raise NotImplementedError('EntityProxyField subclasses must specify a descriptor_class.')
-		self.verbose_name = kwargs.get('verbose_name', None)
-		self.help_text = kwargs.get('help_text', None)
+		self.verbose_name = verbose_name
+		self.help_text = help_text
+		self.default = default
+		self.editable = editable
 	
 	def actually_contribute_to_class(self, sender, **kwargs):
 		sender._entity_meta.add_proxy_field(self)
@@ -39,6 +42,9 @@ class EntityProxyField(object):
 	
 	def value_from_object(self, obj):
 		return getattr(obj, self.attname)
+	
+	def has_default(self):
+		return self.default is not NOT_PROVIDED
 
 
 class AttributeFieldDescriptor(object):
@@ -56,7 +62,7 @@ class AttributeFieldDescriptor(object):
 			except KeyError:
 				return None
 		else:
-			raise AttributeError('The \'%s\' attribute can only be accessed from %s instances.' % (self.field.name, owner.__name__))
+			return None
 	
 	def __set__(self, instance, value):
 		raise NotImplementedError('AttributeFieldDescriptor subclasses must implement a __set__ method.')
@@ -86,7 +92,7 @@ class ForeignKeyAttributeDescriptor(AttributeFieldDescriptor):
 
 class ManyToManyAttributeDescriptor(AttributeFieldDescriptor):
 	def __set__(self, instance, value):
-		if isinstance(value, models.QuerySet):
+		if isinstance(value, models.query.QuerySet):
 			if self.field in instance._removed_attribute_registry:
 				instance._removed_attribute_registry.remove(self.field)
 			instance._added_attribute_registry[self.field] = value
@@ -124,6 +130,8 @@ class JSONAttribute(AttributeField):
 	
 	def formfield(self, **kwargs):
 		defaults = {'required': False, 'label': capfirst(self.verbose_name), 'help_text': self.help_text}
+		if self.has_default():
+			defaults['initial'] = self.default
 		defaults.update(kwargs)
 		return self.field_template.formfield(**defaults)
 	
@@ -153,6 +161,8 @@ class ForeignKeyAttribute(AttributeField):
 	
 	def formfield(self, form_class=forms.ModelChoiceField, **kwargs):
 		defaults = {'required': False, 'label': capfirst(self.verbose_name), 'help_text': self.help_text}
+		if self.has_default():
+			defaults['initial'] = self.default
 		defaults.update(kwargs)
 		return form_class(self.model._default_manager.complex_filter(self.limit_choices_to), **defaults)