X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/6b1eb578f544517620de8e0abbec391a839a3d0c..c0d303555a7ceb29fcaf03d067fb871476fe4c53:/models/fields.py

diff --git a/models/fields.py b/models/fields.py
index 50df799..3e43c0f 100644
--- a/models/fields.py
+++ b/models/fields.py
@@ -1,28 +1,33 @@
-from django.db import models
 from django import forms
-from django.core.exceptions import FieldError
+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.models.base import Entity
 from philo.signals import entity_class_prepared
+from philo.validators import TemplateValidator, json_validator
 
 
-__all__ = ('AttributeField', 'RelationshipField')
+__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)
 		setattr(sender, self.attname, self.descriptor_class(self))
 	
 	def contribute_to_class(self, cls, name):
+		from philo.models.base import Entity
 		if issubclass(cls, Entity):
 			self.name = name
 			self.attname = name
@@ -37,6 +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):
@@ -45,30 +53,73 @@ class AttributeFieldDescriptor(object):
 	
 	def __get__(self, instance, owner):
 		if instance:
-			if self.field.key in instance._added_attribute_registry:
-				return instance._added_attribute_registry[self.field.key]
-			if self.field.key in instance._removed_attribute_registry:
+			if self.field in instance._added_attribute_registry:
+				return instance._added_attribute_registry[self.field]
+			if self.field in instance._removed_attribute_registry:
 				return None
 			try:
 				return instance.attributes[self.field.key]
 			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):
-		if self.field.key in instance._removed_attribute_registry:
-			instance._removed_attribute_registry.remove(self.field.key)
-		instance._added_attribute_registry[self.field.key] = value
+		raise NotImplementedError('AttributeFieldDescriptor subclasses must implement a __set__ method.')
 	
 	def __delete__(self, instance):
-		if self.field.key in instance._added_attribute_registry:
-			del instance._added_attribute_registry[self.field.key]
-		instance._removed_attribute_registry.append(self.field.key)
+		if self.field in instance._added_attribute_registry:
+			del instance._added_attribute_registry[self.field]
+		instance._removed_attribute_registry.append(self.field)
+
+
+class JSONAttributeDescriptor(AttributeFieldDescriptor):
+	def __set__(self, instance, value):
+		if self.field in instance._removed_attribute_registry:
+			instance._removed_attribute_registry.remove(self.field)
+		instance._added_attribute_registry[self.field] = value
+
+
+class ForeignKeyAttributeDescriptor(AttributeFieldDescriptor):
+	def __set__(self, instance, value):
+		if isinstance(value, (models.Model, type(None))):
+			if self.field in instance._removed_attribute_registry:
+				instance._removed_attribute_registry.remove(self.field)
+			instance._added_attribute_registry[self.field] = value
+		else:
+			raise AttributeError('The \'%s\' attribute can only be set using existing Model objects.' % self.field.name)
+
+
+class ManyToManyAttributeDescriptor(AttributeFieldDescriptor):
+	def __set__(self, instance, value):
+		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
+		else:
+			raise AttributeError('The \'%s\' attribute can only be set to a QuerySet.' % self.field.name)
 
 
 class AttributeField(EntityProxyField):
-	descriptor_class = AttributeFieldDescriptor
+	def contribute_to_class(self, cls, name):
+		super(AttributeField, self).contribute_to_class(cls, name)
+		if self.key is None:
+			self.key = name
+	
+	def set_attribute_value(self, attribute, value, value_class):
+		if not isinstance(attribute.value, value_class):
+			if isinstance(attribute.value, models.Model):
+				attribute.value.delete()
+			new_value = value_class()
+		else:
+			new_value = attribute.value
+		new_value.value = value
+		new_value.save()
+		attribute.value = new_value
+
+
+class JSONAttribute(AttributeField):
+	descriptor_class = JSONAttributeDescriptor
 	
 	def __init__(self, field_template=None, key=None, **kwargs):
 		super(AttributeField, self).__init__(**kwargs)
@@ -77,69 +128,129 @@ class AttributeField(EntityProxyField):
 			field_template = models.CharField(max_length=255)
 		self.field_template = field_template
 	
-	def contribute_to_class(self, cls, name):
-		super(AttributeField, self).contribute_to_class(cls, name)
-		if self.key is None:
-			self.key = name
-	
 	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)
-
-
-class RelationshipFieldDescriptor(object):
-	def __init__(self, field):
-		self.field = field
 	
-	def __get__(self, instance, owner):
-		if instance:
-			if self.field.key in instance._added_relationship_registry:
-				return instance._added_relationship_registry[self.field.key]
-			if self.field.key in instance._removed_relationship_registry:
-				return None
-			try:
-				return instance.relationships[self.field.key]
-			except KeyError:
-				return None
-		else:
-			raise AttributeError('The \'%s\' attribute can only be accessed from %s instances.' % (self.field.name, owner.__name__))
-	
-	def __set__(self, instance, value):
-		if isinstance(value, (models.Model, type(None))):
-			if self.field.key in instance._removed_relationship_registry:
-				instance._removed_relationship_registry.remove(self.field.key)
-			instance._added_relationship_registry[self.field.key] = value
-		else:
-			raise AttributeError('The \'%s\' attribute can only be set using existing Model objects.' % self.field.name)
+	def value_from_object(self, obj):
+		try:
+			return getattr(obj, self.attname)
+		except AttributeError:
+			return None
 	
-	def __delete__(self, instance):
-		if self.field.key in instance._added_relationship_registry:
-			del instance._added_relationship_registry[self.field.key]
-		instance._removed_relationship_registry.append(self.field.key)
+	def set_attribute_value(self, attribute, value, value_class=None):
+		if value_class is None:
+			from philo.models.base import JSONValue
+			value_class = JSONValue
+		super(JSONAttribute, self).set_attribute_value(attribute, value, value_class)
 
 
-class RelationshipField(EntityProxyField):
-	descriptor_class = RelationshipFieldDescriptor
+class ForeignKeyAttribute(AttributeField):
+	descriptor_class = ForeignKeyAttributeDescriptor
 	
 	def __init__(self, model, limit_choices_to=None, key=None, **kwargs):
-		super(RelationshipField, self).__init__(**kwargs)
+		super(ForeignKeyAttribute, self).__init__(**kwargs)
 		self.key = key
 		self.model = model
 		if limit_choices_to is None:
 			limit_choices_to = {}
 		self.limit_choices_to = limit_choices_to
 	
-	def contribute_to_class(self, cls, name):
-		super(RelationshipField, self).contribute_to_class(cls, name)
-		if self.key is None:
-			self.key = name
-	
 	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)
 	
 	def value_from_object(self, obj):
-		relobj = super(RelationshipField, self).value_from_object(obj)
-		return getattr(relobj, 'pk', None)
\ No newline at end of file
+		try:
+			relobj = super(ForeignKeyAttribute, self).value_from_object(obj)
+		except AttributeError:
+			return None
+		return getattr(relobj, 'pk', None)
+	
+	def set_attribute_value(self, attribute, value, value_class=None):
+		if value_class is None:
+			from philo.models.base import ForeignKeyValue
+			value_class = ForeignKeyValue
+		super(ForeignKeyAttribute, self).set_attribute_value(attribute, value, value_class)
+
+
+class ManyToManyAttribute(ForeignKeyAttribute):
+	descriptor_class = ManyToManyAttributeDescriptor
+	
+	def formfield(self, form_class=forms.ModelMultipleChoiceField, **kwargs):
+		return super(ManyToManyAttribute, self).formfield(form_class, **kwargs)
+	
+	def set_attribute_value(self, attribute, value, value_class=None):
+		if value_class is None:
+			from philo.models.base import ManyToManyValue
+			value_class = ManyToManyValue
+		super(ManyToManyAttribute, self).set_attribute_value(attribute, value, value_class)
+
+
+class TemplateField(models.TextField):
+	def __init__(self, allow=None, disallow=None, secure=True, *args, **kwargs):
+		super(TemplateField, self).__init__(*args, **kwargs)
+		self.validators.append(TemplateValidator(allow, disallow, secure))
+
+
+class JSONFormField(forms.Field):
+	def clean(self, value):
+		try:
+			return json.loads(value)
+		except Exception, e:
+			raise ValidationError(u'JSON decode error: %s' % e)
+
+
+class JSONDescriptor(object):
+	def __init__(self, field):
+		self.field = field
+	
+	def __get__(self, instance, owner):
+		if instance is None:
+			raise AttributeError # ?
+		
+		if self.field.name not in instance.__dict__:
+			json_string = getattr(instance, self.field.attname)
+			instance.__dict__[self.field.name] = json.loads(json_string)
+		
+		return instance.__dict__[self.field.name]
+	
+	def __set__(self, instance, value):
+		instance.__dict__[self.field.name] = value
+		setattr(instance, self.field.attname, json.dumps(value))
+	
+	def __delete__(self, instance):
+		del(instance.__dict__[self.field.name])
+		setattr(instance, self.field.attname, json.dumps(None))
+
+
+class JSONField(models.TextField):
+	def __init__(self, *args, **kwargs):
+		super(JSONField, self).__init__(*args, **kwargs)
+		self.validators.append(json_validator)
+	
+	def get_attname(self):
+		return "%s_json" % self.name
+	
+	def contribute_to_class(self, cls, name):
+		super(JSONField, self).contribute_to_class(cls, name)
+		setattr(cls, name, JSONDescriptor(self))
+	
+	def formfield(self, *args, **kwargs):
+		kwargs["form_class"] = JSONFormField
+		return super(JSONField, self).formfield(*args, **kwargs)
+
+
+try:
+	from south.modelsinspector import add_introspection_rules
+except ImportError:
+	pass
+else:
+	add_introspection_rules([], ["^philo\.models\.fields\.TemplateField"])
+	add_introspection_rules([], ["^philo\.models\.fields\.JSONField"])
\ No newline at end of file