X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/ed6b9876b7abff0b2dc6266d6f769c319f358a9c..85eb51c030b89dba1c940a8508f1ae1ced1178d4:/philo/models/collections.py diff --git a/philo/models/collections.py b/philo/models/collections.py index 539ecdb..be7b706 100644 --- a/philo/models/collections.py +++ b/philo/models/collections.py @@ -1,17 +1,27 @@ -from django.db import models -from django.contrib.contenttypes.models import ContentType from django.contrib.contenttypes import generic +from django.contrib.contenttypes.models import ContentType +from django.db import models + from philo.models.base import value_content_type_limiter, register_value_model from philo.utils import fattr -from django.template import add_to_builtins as register_templatetags + + +__all__ = ('Collection', 'CollectionMember') class Collection(models.Model): + """ + Collections are curated ordered groupings of arbitrary models. + + """ + #: :class:`CharField` with max_length 255 name = models.CharField(max_length=255) + #: Optional :class:`TextField` description = models.TextField(blank=True, null=True) @fattr(short_description='Members') def get_count(self): + """Returns the number of items in the collection.""" return self.members.count() def __unicode__(self): @@ -25,15 +35,37 @@ class CollectionMemberManager(models.Manager): use_for_related_fields = True def with_model(self, model): + """ + Given a model class or instance, returns a queryset of all instances of that model which have collection members in this manager's scope. + + Example:: + + >>> from philo.models import Collection + >>> from django.contrib.auth.models import User + >>> collection = Collection.objects.get(name="Foo") + >>> collection.members.all() + [, , ] + >>> collection.members.with_model(User) + [, ] + + """ return model._default_manager.filter(pk__in=self.filter(member_content_type=ContentType.objects.get_for_model(model)).values_list('member_object_id', flat=True)) class CollectionMember(models.Model): + """ + The collection member model represents a generic link from a :class:`Collection` to an arbitrary model instance with an attached order. + + """ + #: A :class:`CollectionMemberManager` instance objects = CollectionMemberManager() + #: :class:`ForeignKey` to a :class:`Collection` instance. collection = models.ForeignKey(Collection, related_name='members') + #: The numerical index of the item within the collection (optional). index = models.PositiveIntegerField(verbose_name='Index', help_text='This will determine the ordering of the item within the collection. (Optional)', null=True, blank=True) member_content_type = models.ForeignKey(ContentType, limit_choices_to=value_content_type_limiter, verbose_name='Member type') member_object_id = models.PositiveIntegerField(verbose_name='Member ID') + #: :class:`GenericForeignKey` to an arbitrary model instance. member = generic.GenericForeignKey('member_content_type', 'member_object_id') def __unicode__(self): @@ -43,5 +75,4 @@ class CollectionMember(models.Model): app_label = 'philo' -register_templatetags('philo.templatetags.collections') register_value_model(Collection) \ No newline at end of file