from philo.validators import TemplateValidator, json_validator
-__all__ = ('AttributeField', 'RelationshipField')
+__all__ = ('JSONAttribute', 'ForeignKeyAttribute', 'ManyToManyAttribute')
class EntityProxyField(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]
raise AttributeError('The \'%s\' attribute can only be accessed from %s instances.' % (self.field.name, owner.__name__))
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.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)
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}
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}
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)
+ 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):
git.ithinksw.org / philo.git / blobdiff