X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/2f2aed7e371d11b021432124de8f9bdd436b0832..05bdd3ca32b67c218f7d58c2def2661867b4d1fa:/models/fields.py

diff --git a/models/fields.py b/models/fields.py
index 7f76b9c..3e43c0f 100644
--- a/models/fields.py
+++ b/models/fields.py
@@ -1,12 +1,50 @@
+from django import forms
+from django.core.exceptions import FieldError, ValidationError
 from django.db import models
-from django.db.models import signals
-from django.core.exceptions import ObjectDoesNotExist, FieldError
-from django.contrib.contenttypes.models import ContentType
-from functools import partial
-from philo.models.base import Attribute, Relationship, Entity
+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
+from philo.validators import TemplateValidator, json_validator
 
 
-__all__ = ('AttributeField', 'RelationshipField')
+__all__ = ('JSONAttribute', 'ForeignKeyAttribute', 'ManyToManyAttribute')
+
+
+class EntityProxyField(object):
+	descriptor_class = None
+	
+	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 = 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
+			if self.verbose_name is None and name:
+				self.verbose_name = name.replace('_', ' ')
+			entity_class_prepared.connect(self.actually_contribute_to_class, sender=cls)
+		else:
+			raise FieldError('%s instances can only be declared on Entity subclasses.' % self.__class__.__name__)
+	
+	def formfield(self, *args, **kwargs):
+		raise NotImplementedError('EntityProxyField subclasses must implement a formfield method.')
+	
+	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):
@@ -15,82 +53,204 @@ class AttributeFieldDescriptor(object):
 	
 	def __get__(self, instance, owner):
 		if instance:
+			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.attribute_set.get(key__exact=self.field.key).value
-			except ObjectDoesNotExist:
+				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):
-		try:
-			attribute = instance.attribute_set.get(key__exact=self.field.key)
-		except ObjectDoesNotExist:
-			attribute = Attribute()
-			attribute.entity = instance
-			attribute.key = self.field.key
-		attribute.value = value
-		attribute.save()
+		raise NotImplementedError('AttributeFieldDescriptor subclasses must implement a __set__ method.')
 	
 	def __delete__(self, instance):
-		instance.attribute_set.filter(key__exact=self.field.key).delete()
+		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 AttributeField(object):
-	def __init__(self, key):
+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):
+	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)
 		self.key = key
+		if field_template is None:
+			field_template = models.CharField(max_length=255)
+		self.field_template = field_template
 	
-	def actually_contribute_to_class(self, sender, **kwargs):
-		setattr(sender, self.name, AttributeFieldDescriptor(self))
+	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)
 	
-	def contribute_to_class(self, cls, name):
-		if issubclass(cls, Entity):
-			self.name = name
-			signals.class_prepared.connect(self.actually_contribute_to_class, sender=cls)
-		else:
-			raise FieldError('AttributeFields can only be declared on Entity subclasses.')
+	def value_from_object(self, obj):
+		try:
+			return getattr(obj, self.attname)
+		except AttributeError:
+			return None
+	
+	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 ForeignKeyAttribute(AttributeField):
+	descriptor_class = ForeignKeyAttributeDescriptor
+	
+	def __init__(self, model, limit_choices_to=None, key=None, **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 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):
+		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 RelationshipFieldDescriptor(object):
+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:
-			try:
-				return instance.relationship_set.get(key__exact=self.field.key).value
-			except ObjectDoesNotExist:
-				return None
-		else:
-			raise AttributeError('The \'%s\' attribute can only be accessed from %s instances.' % (self.field.name, owner.__name__))
+		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):
-		if isinstance(value, (models.Model, type(None))):
-			try:
-				relationship = instance.relationship_set.get(key__exact=self.field.key)
-			except ObjectDoesNotExist:
-				relationship = Relationship()
-				relationship.entity = instance
-				relationship.key = self.field.key
-			relationship.value = value
-			relationship.save()
-		else:
-			raise AttributeError('The \'%\' attribute can only be set using existing Model objects.' % self.field.name)
+		instance.__dict__[self.field.name] = value
+		setattr(instance, self.field.attname, json.dumps(value))
 	
 	def __delete__(self, instance):
-		instance.relationship_set.filter(key__exact=self.field.key).delete()
+		del(instance.__dict__[self.field.name])
+		setattr(instance, self.field.attname, json.dumps(None))
 
 
-class RelationshipField(object):
-	def __init__(self, key):
-		self.key = key
+class JSONField(models.TextField):
+	def __init__(self, *args, **kwargs):
+		super(JSONField, self).__init__(*args, **kwargs)
+		self.validators.append(json_validator)
 	
-	def actually_contribute_to_class(self, sender, **kwargs):
-		setattr(sender, self.name, RelationshipFieldDescriptor(self))
+	def get_attname(self):
+		return "%s_json" % self.name
 	
 	def contribute_to_class(self, cls, name):
-		if issubclass(cls, Entity):
-			self.name = name
-			signals.class_prepared.connect(self.actually_contribute_to_class, sender=cls)
-		else:
-			raise FieldError('RelationshipFields can only be declared on Entity subclasses.')
\ No newline at end of file
+		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