author | Sverre Rabbelier <srabbelier@gmail.com> |
Thu, 02 Apr 2009 23:05:31 +0000 | |
changeset 2056 | bbd16a156bde |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
109
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""" |
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34. Generic relations |
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Generic relations let an object have a foreign key to any object through a |
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content-type/object-id field. A generic foreign key can point to any object, |
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be it animal, vegetable, or mineral. |
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The canonical example is tags (although this example implementation is *far* |
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from complete). |
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""" |
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from django.db import models |
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from django.contrib.contenttypes.models import ContentType |
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class TaggedItem(models.Model): |
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"""A tag on an item.""" |
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tag = models.SlugField() |
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content_type = models.ForeignKey(ContentType) |
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object_id = models.PositiveIntegerField() |
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content_object = models.GenericForeignKey() |
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class Meta: |
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ordering = ["tag"] |
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def __str__(self): |
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return self.tag |
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class Animal(models.Model): |
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common_name = models.CharField(maxlength=150) |
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latin_name = models.CharField(maxlength=150) |
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tags = models.GenericRelation(TaggedItem) |
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def __str__(self): |
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return self.common_name |
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class Vegetable(models.Model): |
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name = models.CharField(maxlength=150) |
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is_yucky = models.BooleanField(default=True) |
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tags = models.GenericRelation(TaggedItem) |
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def __str__(self): |
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return self.name |
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class Mineral(models.Model): |
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name = models.CharField(maxlength=150) |
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hardness = models.PositiveSmallIntegerField() |
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# note the lack of an explicit GenericRelation here... |
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def __str__(self): |
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return self.name |
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__test__ = {'API_TESTS':""" |
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# Create the world in 7 lines of code... |
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>>> lion = Animal(common_name="Lion", latin_name="Panthera leo") |
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>>> platypus = Animal(common_name="Platypus", latin_name="Ornithorhynchus anatinus") |
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>>> eggplant = Vegetable(name="Eggplant", is_yucky=True) |
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>>> bacon = Vegetable(name="Bacon", is_yucky=False) |
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>>> quartz = Mineral(name="Quartz", hardness=7) |
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>>> for o in (lion, platypus, eggplant, bacon, quartz): |
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... o.save() |
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# Objects with declared GenericRelations can be tagged directly -- the API |
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# mimics the many-to-many API. |
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>>> bacon.tags.create(tag="fatty") |
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<TaggedItem: fatty> |
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>>> bacon.tags.create(tag="salty") |
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<TaggedItem: salty> |
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>>> lion.tags.create(tag="yellow") |
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<TaggedItem: yellow> |
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>>> lion.tags.create(tag="hairy") |
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<TaggedItem: hairy> |
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>>> lion.tags.all() |
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[<TaggedItem: hairy>, <TaggedItem: yellow>] |
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>>> bacon.tags.all() |
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[<TaggedItem: fatty>, <TaggedItem: salty>] |
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# You can easily access the content object like a foreign key. |
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>>> t = TaggedItem.objects.get(tag="salty") |
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>>> t.content_object |
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<Vegetable: Bacon> |
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# Recall that the Mineral class doesn't have an explicit GenericRelation |
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# defined. That's OK, because you can create TaggedItems explicitly. |
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>>> tag1 = TaggedItem(content_object=quartz, tag="shiny") |
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>>> tag2 = TaggedItem(content_object=quartz, tag="clearish") |
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>>> tag1.save() |
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>>> tag2.save() |
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# However, excluding GenericRelations means your lookups have to be a bit more |
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# explicit. |
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>>> from django.contrib.contenttypes.models import ContentType |
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>>> ctype = ContentType.objects.get_for_model(quartz) |
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>>> TaggedItem.objects.filter(content_type__pk=ctype.id, object_id=quartz.id) |
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[<TaggedItem: clearish>, <TaggedItem: shiny>] |
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# You can set a generic foreign key in the way you'd expect. |
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>>> tag1.content_object = platypus |
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>>> tag1.save() |
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>>> platypus.tags.all() |
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[<TaggedItem: shiny>] |
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>>> TaggedItem.objects.filter(content_type__pk=ctype.id, object_id=quartz.id) |
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[<TaggedItem: clearish>] |
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# If you delete an object with an explicit Generic relation, the related |
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# objects are deleted when the source object is deleted. |
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# Original list of tags: |
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>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()] |
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[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('hairy', <ContentType: animal>, 1), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2), ('yellow', <ContentType: animal>, 1)] |
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114 |
|
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115 |
>>> lion.delete() |
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>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()] |
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[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)] |
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118 |
|
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119 |
# If Generic Relation is not explicitly defined, any related objects |
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# remain after deletion of the source object. |
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>>> quartz.delete() |
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>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()] |
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[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)] |
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124 |
|
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# If you delete a tag, the objects using the tag are unaffected |
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# (other than losing a tag) |
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>>> tag = TaggedItem.objects.get(id=1) |
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>>> tag.delete() |
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>>> bacon.tags.all() |
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[<TaggedItem: salty>] |
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>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()] |
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[('clearish', <ContentType: mineral>, 1), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)] |
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133 |
|
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"""} |