author | Nishanth Amuluru <nishanth@fossee.in> |
Tue, 11 Jan 2011 12:36:55 +0530 | |
changeset 141 | ed2dadfc829a |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
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""" |
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Custom managers for Django models registered with the tagging |
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application. |
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""" |
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from django.contrib.contenttypes.models import ContentType |
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from django.db import models |
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|
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from tagging.models import Tag, TaggedItem |
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class ModelTagManager(models.Manager): |
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""" |
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A manager for retrieving tags for a particular model. |
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""" |
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def get_query_set(self): |
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ctype = ContentType.objects.get_for_model(self.model) |
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return Tag.objects.filter( |
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items__content_type__pk=ctype.pk).distinct() |
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def cloud(self, *args, **kwargs): |
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return Tag.objects.cloud_for_model(self.model, *args, **kwargs) |
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|
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def related(self, tags, *args, **kwargs): |
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return Tag.objects.related_for_model(tags, self.model, *args, **kwargs) |
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def usage(self, *args, **kwargs): |
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return Tag.objects.usage_for_model(self.model, *args, **kwargs) |
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class ModelTaggedItemManager(models.Manager): |
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""" |
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A manager for retrieving model instances based on their tags. |
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""" |
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def related_to(self, obj, queryset=None, num=None): |
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if queryset is None: |
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return TaggedItem.objects.get_related(obj, self.model, num=num) |
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else: |
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return TaggedItem.objects.get_related(obj, queryset, num=num) |
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def with_all(self, tags, queryset=None): |
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if queryset is None: |
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return TaggedItem.objects.get_by_model(self.model, tags) |
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else: |
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return TaggedItem.objects.get_by_model(queryset, tags) |
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def with_any(self, tags, queryset=None): |
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if queryset is None: |
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return TaggedItem.objects.get_union_by_model(self.model, tags) |
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else: |
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return TaggedItem.objects.get_union_by_model(queryset, tags) |
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class TagDescriptor(object): |
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""" |
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A descriptor which provides access to a ``ModelTagManager`` for |
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model classes and simple retrieval, updating and deletion of tags |
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for model instances. |
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""" |
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def __get__(self, instance, owner): |
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if not instance: |
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tag_manager = ModelTagManager() |
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tag_manager.model = owner |
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return tag_manager |
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else: |
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return Tag.objects.get_for_object(instance) |
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def __set__(self, instance, value): |
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Tag.objects.update_tags(instance, value) |
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def __delete__(self, instance): |
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Tag.objects.update_tags(instance, None) |