from django import forms
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
-from django.core.exceptions import ObjectDoesNotExist
+from django.core.exceptions import ValidationError
from django.core.validators import RegexValidator
from django.db import models
from django.utils import simplejson as json
from philo.validators import json_validator
-__all__ = ('Tag', 'value_content_type_limiter', 'register_value_model', 'unregister_value_model', 'JSONValue', 'ForeignKeyValue', 'ManyToManyValue', 'Attribute', 'Entity', 'TreeEntity')
-
-
-class Tag(models.Model):
- """A simple, generic model for tagging."""
- #: A CharField (max length 255) which contains the name of the tag.
- name = models.CharField(max_length=255)
- #: A CharField (max length 255) which contains the tag's unique slug.
- slug = models.SlugField(max_length=255, unique=True)
-
- def __unicode__(self):
- """Returns the value of the :attr:`name` field"""
- return self.name
-
- class Meta:
- app_label = 'philo'
- ordering = ('name',)
+__all__ = ('value_content_type_limiter', 'register_value_model', 'unregister_value_model', 'JSONValue', 'ForeignKeyValue', 'ManyToManyValue', 'Attribute', 'Entity', 'TreeEntity', 'SlugTreeEntity')
#: An instance of :class:`.ContentTypeRegistryLimiter` which is used to track the content types which can be related to by :class:`ForeignKeyValue`\ s and :class:`ManyToManyValue`\ s.
value_content_type_limiter.register_class(model)
-register_value_model(Tag)
-
-
def unregister_value_model(model):
"""Registers a model as a valid content type for a :class:`ForeignKeyValue` or :class:`ManyToManyValue` through the :data:`value_content_type_limiter`."""
value_content_type_limiter.unregister_class(model)
"""An abstract class that simplifies access to related attributes. Most models provided by Philo subclass Entity."""
__metaclass__ = EntityBase
- attribute_set = generic.GenericRelation(Attribute, content_type_field='entity_content_type', object_id_field='entity_object_id')
+ attribute_set = generic.GenericRelation(Attribute, content_type_field='entity_content_type', object_id_field='entity_object_id', related_name='%(app_label)s_%(class)s_set')
def get_attribute_mapper(self, mapper=AttributeMapper):
"""
"""
return mapper(self)
- attributes = property(get_attribute_mapper)
+
+ @property
+ def attributes(self):
+ if not hasattr(self, '_attributes'):
+ self._attributes = self.get_attribute_mapper()
+ return self._attributes
class Meta:
abstract = True
objects = TreeEntityManager()
parent = models.ForeignKey('self', related_name='children', null=True, blank=True)
- def get_path(self, root=None, pathsep='/', field='slug'):
+ def get_path(self, root=None, pathsep='/', field='pk', memoize=True):
"""
:param root: Only return the path since this object.
:param pathsep: The path separator to use when constructing an instance's path
:param field: The field to pull path information from for each ancestor.
+ :param memoize: Whether to use memoized results. Since, in most cases, the ancestors of a TreeEntity will not change over the course of an instance's lifetime, this defaults to ``True``.
:returns: A string representation of an object's path.
"""
if root == self:
return ''
- if root is None and self.is_root_node():
+ parent_id = getattr(self, "%s_id" % self._mptt_meta.parent_attr)
+ if getattr(root, 'pk', None) == parent_id:
return getattr(self, field, '?')
if root is not None and not self.is_descendant_of(root):
raise AncestorDoesNotExist(root)
+ if memoize:
+ memo_args = (parent_id, getattr(root, 'pk', None), pathsep, getattr(self, field, '?'))
+ try:
+ return self._path_memo[memo_args]
+ except AttributeError:
+ self._path_memo = {}
+ except KeyError:
+ pass
+
qs = self.get_ancestors(include_self=True)
if root is not None:
qs = qs.filter(**{'%s__gt' % self._mptt_meta.level_attr: root.get_level()})
- return pathsep.join([getattr(parent, field, '?') for parent in qs])
+ path = pathsep.join([getattr(parent, field, '?') for parent in qs])
+
+ if memoize:
+ self._path_memo[memo_args] = path
+
+ return path
path = property(get_path)
def get_attribute_mapper(self, mapper=None):
"""
if mapper is None:
- if self.parent:
+ if getattr(self, "%s_id" % self._mptt_meta.parent_attr):
mapper = TreeAttributeMapper
else:
mapper = AttributeMapper
return super(TreeEntity, self).get_attribute_mapper(mapper)
- attributes = property(get_attribute_mapper)
def __unicode__(self):
return self.path
objects = SlugTreeEntityManager()
slug = models.SlugField(max_length=255)
- def get_path(self, root=None, pathsep='/', field='slug'):
- return super(SlugTreeEntity, self).get_path(root, pathsep, field)
+ def get_path(self, root=None, pathsep='/', field='slug', memoize=True):
+ return super(SlugTreeEntity, self).get_path(root, pathsep, field, memoize)
path = property(get_path)
+ def clean(self):
+ if getattr(self, "%s_id" % self._mptt_meta.parent_attr) is None:
+ try:
+ self._default_manager.exclude(pk=self.pk).get(slug=self.slug, parent__isnull=True)
+ except self.DoesNotExist:
+ pass
+ else:
+ raise ValidationError(self.unique_error_message(self.__class__, ('parent', 'slug')))
+
class Meta:
unique_together = ('parent', 'slug')
abstract = True
\ No newline at end of file
git.ithinksw.org / philo.git / blobdiff