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')
+__all__ = ('Tag', 'value_content_type_limiter', 'register_value_model', 'unregister_value_model', 'JSONValue', 'ForeignKeyValue', 'ManyToManyValue', 'Attribute', 'Entity', 'TreeEntity', 'SlugTreeEntity')
class Tag(models.Model):
ordering = ('name',)
-class Titled(models.Model):
- title = models.CharField(max_length=255)
- slug = models.SlugField(max_length=255)
-
- def __unicode__(self):
- return self.title
-
- class Meta:
- abstract = True
-
-
#: 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 = ContentTypeRegistryLimiter()
abstract = True
-#: An instance of :class:`ContentTypeSubclassLimiter` which is used to track the content types which are considered valid value models for an :class:`Attribute`.
+#: An instance of :class:`.ContentTypeSubclassLimiter` which is used to track the content types which are considered valid value models for an :class:`Attribute`.
attribute_value_limiter = ContentTypeSubclassLimiter(AttributeValue)
class Attribute(models.Model):
- """Represents an arbitrary key/value pair on an arbitrary :class:`Model` where the key consists of word characters and the value is a subclass of :class:`AttributeValue`."""
+ """
+ :class:`Attribute`\ s exist primarily to let arbitrary data be attached to arbitrary model instances without altering the database schema and without guaranteeing that the data will be available on every instance of that model.
+
+ Generally, :class:`Attribute`\ s will not be accessed as models; instead, they will be accessed through the :attr:`Entity.attributes` property, which allows direct dictionary getting and setting of the value of an :class:`Attribute` with its key.
+
+ """
entity_content_type = models.ForeignKey(ContentType, related_name='attribute_entity_set', verbose_name='Entity type')
entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID', db_index=True)
"""
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
-class TreeManager(models.Manager):
+class TreeEntityBase(MPTTModelBase, EntityBase):
+ def __new__(meta, name, bases, attrs):
+ attrs['_mptt_meta'] = MPTTOptions(attrs.pop('MPTTMeta', None))
+ cls = EntityBase.__new__(meta, name, bases, attrs)
+
+ return meta.register(cls)
+
+
+class TreeEntityManager(models.Manager):
use_for_related_fields = True
- def get_with_path(self, path, root=None, absolute_result=True, pathsep='/', field='slug'):
+ def get_with_path(self, path, root=None, absolute_result=True, pathsep='/', field='pk'):
"""
If ``absolute_result`` is ``True``, returns the object at ``path`` (starting at ``root``) or raises an :class:`~django.core.exceptions.ObjectDoesNotExist` exception. Otherwise, returns a tuple containing the deepest object found along ``path`` (or ``root`` if no deeper object is found) and the remainder of the path after that object as a string (or None if there is no remaining path).
return find_obj(segments, len(segments)/2 or len(segments))
-class TreeModel(MPTTModel):
- objects = TreeManager()
+class TreeEntity(Entity, MPTTModel):
+ """An abstract subclass of Entity which represents a tree relationship."""
+
+ __metaclass__ = TreeEntityBase
+ objects = TreeEntityManager()
parent = models.ForeignKey('self', related_name='children', null=True, blank=True)
- slug = models.SlugField(max_length=255)
- 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():
+ return getattr(self, field, '?')
+
if root is not None and not self.is_descendant_of(root):
raise AncestorDoesNotExist(root)
+ if memoize:
+ memo_args = (getattr(self, "%s_id" % self._mptt_meta.parent_attr), 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 = property(get_path)
-
- def __unicode__(self):
- return self.path
-
- class Meta:
- unique_together = (('parent', 'slug'),)
- abstract = True
-
-
-class TreeEntityBase(MPTTModelBase, EntityBase):
- def __new__(meta, name, bases, attrs):
- attrs['_mptt_meta'] = MPTTOptions(attrs.pop('MPTTMeta', None))
- cls = EntityBase.__new__(meta, name, bases, attrs)
+ path = pathsep.join([getattr(parent, field, '?') for parent in qs])
- return meta.register(cls)
-
-
-class TreeEntity(Entity, TreeModel):
- """An abstract subclass of Entity which represents a tree relationship."""
-
- __metaclass__ = TreeEntityBase
+ 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
+
+ class Meta:
+ abstract = True
+
+
+class SlugTreeEntityManager(TreeEntityManager):
+ def get_with_path(self, path, root=None, absolute_result=True, pathsep='/', field='slug'):
+ return super(SlugTreeEntityManager, self).get_with_path(path, root, absolute_result, pathsep, field)
+
+
+class SlugTreeEntity(TreeEntity):
+ objects = SlugTreeEntityManager()
+ slug = models.SlugField(max_length=255)
+
+ 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