X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/357027375ff8867f42ca34bcbfb5a78b5b185fc3..368d5388fe92a5986837973afda12253173b13cc:/src/newtagging/models.py diff --git a/src/newtagging/models.py b/src/newtagging/models.py index 694f5b868..b90ea8e83 100644 --- a/src/newtagging/models.py +++ b/src/newtagging/models.py @@ -3,19 +3,16 @@ Models and managers for generic tagging. """ -from django.contrib.contenttypes.fields import GenericForeignKey from django.contrib.contenttypes.models import ContentType from django.db import connection, models -from django.utils.translation import ugettext_lazy as _ from django.db.models.base import ModelBase -from django.core.exceptions import ObjectDoesNotExist from django.dispatch import Signal qn = connection.ops.quote_name - tags_updated = Signal(providing_args=["affected_tags"]) + def get_queryset_and_model(queryset_or_model): """ Given a ``QuerySet`` or a ``Model``, returns a two-tuple of @@ -27,7 +24,7 @@ def get_queryset_and_model(queryset_or_model): try: return queryset_or_model, queryset_or_model.model except AttributeError: - return queryset_or_model._default_manager.all(), queryset_or_model + return queryset_or_model.objects.all(), queryset_or_model ############ @@ -58,18 +55,19 @@ class TagManager(models.Manager): updated_tags = self.model.get_tag_list(tags) # Remove tags which no longer apply - tags_for_removal = [tag for tag in current_tags \ - if tag not in updated_tags] + tags_for_removal = [tag for tag in current_tags if tag not in updated_tags] if len(tags_for_removal): - self.intermediary_table_model._default_manager.filter(content_type__pk=content_type.pk, - object_id=obj.pk, - tag__in=tags_for_removal).delete() + self.intermediary_table_model.objects.filter( + content_type__pk=content_type.pk, + object_id=obj.pk, + tag__in=tags_for_removal).delete() # Add new tags - tags_to_add = [tag for tag in updated_tags - if tag not in current_tags] + tags_to_add = [tag for tag in updated_tags if tag not in current_tags] for tag in tags_to_add: - if tag not in current_tags: - self.intermediary_table_model._default_manager.create(tag=tag, content_object=obj) + existing = self.intermediary_table_model.objects.filter( + content_type__pk=content_type.pk, object_id=obj.pk, tag=tag) + if not existing: + self.intermediary_table_model.objects.create(tag=tag, content_object=obj) tags_updated.send(sender=type(obj), instance=obj, affected_tags=tags_to_add + tags_for_removal) @@ -78,8 +76,18 @@ class TagManager(models.Manager): Remove tag from an object. """ content_type = ContentType.objects.get_for_model(obj) - self.intermediary_table_model._default_manager.filter(content_type__pk=content_type.pk, - object_id=obj.pk, tag=tag).delete() + self.intermediary_table_model.objects.filter( + content_type__pk=content_type.pk, object_id=obj.pk, tag=tag).delete() + + def add_tag(self, obj, tag): + """ + Add tag to an object. + """ + content_type = ContentType.objects.get_for_model(obj) + relations = self.intermediary_table_model.objects.filter( + content_type__pk=content_type.pk, object_id=obj.pk, tag=tag) + if not relations: + self.intermediary_table_model.objects.create(tag=tag, content_object=obj) def get_for_object(self, obj): """ @@ -105,9 +113,10 @@ class TagManager(models.Manager): ``filters`` argument. """ # TODO: Do we really need this filters stuff? - if filters is None: filters = {} + if filters is None: + filters = {} - queryset = model._default_manager.filter() + queryset = model.objects.filter() for f in filters.items(): queryset.query.add_filter(f) usage = self.usage_for_queryset(queryset, counts) @@ -122,10 +131,9 @@ class TagManager(models.Manager): each tag, indicating how many times it has been used against the Model class in question. """ - usage = self.model._default_manager.filter( + usage = self.model.objects.filter( items__content_type=ContentType.objects.get_for_model(queryset.model), - items__object_id__in=queryset - ) + items__object_id__in=queryset) if counts: usage = usage.annotate(count=models.Count('id')) else: @@ -197,42 +205,13 @@ class TaggedItemManager(models.Manager): ########## # Models # ########## -def create_intermediary_table_model(model): - """Create an intermediary table model for the specific tag model""" - name = model.__name__ + 'Relation' - - class Meta: - db_table = '%s_relation' % model._meta.db_table - unique_together = (('tag', 'content_type', 'object_id'),) - app_label = model._meta.app_label - - def obj_unicode(self): - try: - return u'%s [%s]' % (self.content_type.get_object_for_this_type(pk=self.object_id), self.tag) - except ObjectDoesNotExist: - return u' [%s]' % self.tag - - # Set up a dictionary to simulate declarations within a class - attrs = { - '__module__': model.__module__, - 'Meta': Meta, - 'tag': models.ForeignKey(model, verbose_name=_('tag'), related_name='items'), - 'content_type': models.ForeignKey(ContentType, verbose_name=_('content type')), - 'object_id': models.PositiveIntegerField(_('object id'), db_index=True), - 'content_object': GenericForeignKey('content_type', 'object_id'), - '__unicode__': obj_unicode, - } - - return type(name, (models.Model,), attrs) - class TagMeta(ModelBase): - "Metaclass for tag models (models inheriting from TagBase)." + """Metaclass for tag models (models inheriting from TagBase).""" def __new__(mcs, name, bases, attrs): model = super(TagMeta, mcs).__new__(mcs, name, bases, attrs) if not model._meta.abstract: - # Create an intermediary table and register custom managers for concrete models - model.intermediary_table_model = create_intermediary_table_model(model) + # Register custom managers for concrete models TagManager(model.intermediary_table_model).contribute_to_class(model, 'objects') TaggedItemManager(model).contribute_to_class(model.intermediary_table_model, 'objects') return model @@ -256,4 +235,3 @@ class TagBase(models.Model): return [tag_list] else: return tag_list -