X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/2b808329bca3af8d614aa13af7b6ccf24092d4ce..4c276c601b86efbba0236eea2bda190bdff48af1:/models/base.py diff --git a/models/base.py b/models/base.py index 5ca9d93..ceeb81e 100644 --- a/models/base.py +++ b/models/base.py @@ -3,15 +3,33 @@ from django.contrib.contenttypes.models import ContentType 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 philo.validators import json_validator from UserDict import DictMixin -def register_value_model(model): - pass +class Tag(models.Model): + name = models.CharField(max_length=255) + slug = models.SlugField(max_length=255, 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): @@ -19,7 +37,7 @@ class Attribute(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) - json_value = models.TextField(verbose_name='Value (JSON)', help_text='This value must be valid JSON.') + json_value = models.TextField(verbose_name='Value (JSON)', help_text='This value must be valid JSON.', validators=[json_validator]) def get_value(self): return json.loads(self.json_value) @@ -37,6 +55,19 @@ 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): @@ -44,8 +75,8 @@ 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): @@ -53,27 +84,53 @@ class Relationship(models.Model): 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') @@ -85,9 +142,65 @@ class Entity(models.Model): 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): @@ -129,26 +242,44 @@ class TreeManager(models.Manager): class TreeModel(models.Model): objects = TreeManager() parent = models.ForeignKey('self', related_name='children', null=True, blank=True) - slug = models.SlugField() + slug = models.SlugField(max_length=255) - 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: @@ -162,46 +293,4 @@ class TreeEntity(TreeModel, Entity): 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