from django.contrib.contenttypes import generic
from django.utils import simplejson as json
from django.core.exceptions import ObjectDoesNotExist
+from philo.exceptions import AncestorDoesNotExist
+from philo.utils import ContentTypeRegistryLimiter
+from philo.signals import entity_class_prepared
from UserDict import DictMixin
-def register_value_model(model):
- pass
+class Tag(models.Model):
+ name = models.CharField(max_length=250)
+ slug = models.SlugField(unique=True)
+
+ def __unicode__(self):
+ return self.name
+
+ class Meta:
+ app_label = 'philo'
-def unregister_value_model(model):
- pass
+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
class Attribute(models.Model):
class Meta:
app_label = 'philo'
+ unique_together = ('key', 'entity_content_type', 'entity_object_id')
+
+
+value_content_type_limiter = ContentTypeRegistryLimiter()
+
+
+def register_value_model(model):
+ value_content_type_limiter.register_class(model)
+
+
+def unregister_value_model(model):
+ value_content_type_limiter.unregister_class(model)
+
class Relationship(models.Model):
entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID')
entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id')
key = models.CharField(max_length=255)
- value_content_type = models.ForeignKey(ContentType, related_name='relationship_value_set', verbose_name='Value type')
- value_object_id = models.PositiveIntegerField(verbose_name='Value ID')
+ value_content_type = models.ForeignKey(ContentType, related_name='relationship_value_set', limit_choices_to=value_content_type_limiter, verbose_name='Value type', null=True, blank=True)
+ value_object_id = models.PositiveIntegerField(verbose_name='Value ID', null=True, blank=True)
value = generic.GenericForeignKey('value_content_type', 'value_object_id')
def __unicode__(self):
class Meta:
app_label = 'philo'
+ unique_together = ('key', 'entity_content_type', 'entity_object_id')
class QuerySetMapper(object, DictMixin):
def __init__(self, queryset, passthrough=None):
self.queryset = queryset
self.passthrough = passthrough
+
def __getitem__(self, key):
try:
return self.queryset.get(key__exact=key).value
except ObjectDoesNotExist:
- if self.passthrough:
+ if self.passthrough is not None:
return self.passthrough.__getitem__(key)
raise KeyError
+
def keys(self):
keys = set(self.queryset.values_list('key', flat=True).distinct())
- if self.passthrough:
- keys += set(self.passthrough.keys())
+ if self.passthrough is not None:
+ keys |= set(self.passthrough.keys())
return list(keys)
+class EntityOptions(object):
+ def __init__(self, options):
+ if options is not None:
+ for key, value in options.__dict__.items():
+ setattr(self, key, value)
+ if not hasattr(self, 'proxy_fields'):
+ self.proxy_fields = []
+
+ def add_proxy_field(self, proxy_field):
+ self.proxy_fields.append(proxy_field)
+
+
+class EntityBase(models.base.ModelBase):
+ def __new__(cls, name, bases, attrs):
+ new = super(EntityBase, cls).__new__(cls, name, bases, attrs)
+ entity_options = attrs.pop('EntityMeta', None)
+ setattr(new, '_entity_meta', EntityOptions(entity_options))
+ entity_class_prepared.send(sender=new)
+ return new
+
+
class Entity(models.Model):
+ __metaclass__ = EntityBase
+
attribute_set = generic.GenericRelation(Attribute, content_type_field='entity_content_type', object_id_field='entity_object_id')
relationship_set = generic.GenericRelation(Relationship, content_type_field='entity_content_type', object_id_field='entity_object_id')
def relationships(self):
return QuerySetMapper(self.relationship_set)
+ @property
+ def _added_attribute_registry(self):
+ if not hasattr(self, '_real_added_attribute_registry'):
+ self._real_added_attribute_registry = {}
+ return self._real_added_attribute_registry
+
+ @property
+ def _removed_attribute_registry(self):
+ if not hasattr(self, '_real_removed_attribute_registry'):
+ self._real_removed_attribute_registry = []
+ return self._real_removed_attribute_registry
+
+ @property
+ def _added_relationship_registry(self):
+ if not hasattr(self, '_real_added_relationship_registry'):
+ self._real_added_relationship_registry = {}
+ return self._real_added_relationship_registry
+
+ @property
+ def _removed_relationship_registry(self):
+ if not hasattr(self, '_real_removed_relationship_registry'):
+ self._real_removed_relationship_registry = []
+ return self._real_removed_relationship_registry
+
+ def save(self, *args, **kwargs):
+ super(Entity, self).save(*args, **kwargs)
+
+ for key in self._removed_attribute_registry:
+ self.attribute_set.filter(key__exact=key).delete()
+ del self._removed_attribute_registry[:]
+
+ for key, value in self._added_attribute_registry.items():
+ try:
+ attribute = self.attribute_set.get(key__exact=key)
+ except Attribute.DoesNotExist:
+ attribute = Attribute()
+ attribute.entity = self
+ attribute.key = key
+ attribute.value = value
+ attribute.save()
+ self._added_attribute_registry.clear()
+
+ for key in self._removed_relationship_registry:
+ self.relationship_set.filter(key__exact=key).delete()
+ del self._removed_relationship_registry[:]
+
+ for key, value in self._added_relationship_registry.items():
+ try:
+ relationship = self.relationship_set.get(key__exact=key)
+ except Relationship.DoesNotExist:
+ relationship = Relationship()
+ relationship.entity = self
+ relationship.key = key
+ relationship.value = value
+ relationship.save()
+ self._added_relationship_registry.clear()
+
class Meta:
abstract = True
- app_label = 'philo'
class TreeManager(models.Manager):
parent = models.ForeignKey('self', related_name='children', null=True, blank=True)
slug = models.SlugField()
- def get_path(self, pathsep='/', field='slug'):
- path = getattr(self, field, '?')
- parent = self.parent
+ def has_ancestor(self, ancestor):
+ parent = self
while parent:
- path = getattr(parent, field, '?') + pathsep + path
+ if parent == ancestor:
+ return True
parent = parent.parent
- return path
+ return False
+
+ def get_path(self, root=None, pathsep='/', field='slug'):
+ if root is not None:
+ if not self.has_ancestor(root):
+ raise AncestorDoesNotExist(root)
+ path = ''
+ parent = self
+ while parent and parent != root:
+ path = getattr(parent, field, '?') + pathsep + path
+ parent = parent.parent
+ return path
+ else:
+ path = getattr(self, field, '?')
+ parent = self.parent
+ while parent and parent != root:
+ path = getattr(parent, field, '?') + pathsep + path
+ parent = parent.parent
+ return path
path = property(get_path)
def __unicode__(self):
return self.path
class Meta:
+ unique_together = (('parent', 'slug'),)
abstract = True
- app_label = 'philo'
-class TreeEntity(TreeModel, Entity):
+class TreeEntity(Entity, TreeModel):
@property
def attributes(self):
if self.parent:
return super(TreeEntity, self).relationships
class Meta:
- abstract = True
- app_label = 'philo'
-
-
-class InheritableTreeEntity(TreeEntity):
- instance_type = models.ForeignKey(ContentType, editable=False)
-
- def save(self, force_insert=False, force_update=False):
- if not hasattr(self, 'instance_type_ptr'):
- self.instance_type = ContentType.objects.get_for_model(self.__class__)
- super(InheritableTreeEntity, self).save(force_insert, force_update)
-
- @property
- def instance(self):
- try:
- return self.instance_type.get_object_for_this_type(id=self.id)
- except:
- return None
-
- def get_path(self, pathsep='/', field='slug'):
- path = getattr(self.instance, field, getattr(self.instance, 'slug', '?'))
- parent = self.parent
- while parent:
- path = getattr(parent.instance, field, getattr(parent.instance, 'slug', '?')) + pathsep + path
- parent = parent.parent
- return path
- path = property(get_path)
-
- @property
- def attributes(self):
- if self.parent:
- return QuerySetMapper(self.instance.attribute_set, passthrough=self.parent.instance.attributes)
- return QuerySetMapper(self.instance.attribute_set)
-
- @property
- def relationships(self):
- if self.parent:
- return QuerySetMapper(self.instance.relationship_set, passthrough=self.parent.instance.relationships)
- return QuerySetMapper(self.instance.relationship_set)
-
- class Meta:
- abstract = True
- app_label = 'philo'
\ No newline at end of file
+ abstract = True
\ No newline at end of file
git.ithinksw.org / philo.git / blobdiff