226 lines
6.8 KiB
Python
226 lines
6.8 KiB
Python
from __future__ import unicode_literals
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import django
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from django import VERSION
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from django.contrib.contenttypes.models import ContentType
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from django.db import IntegrityError, models, transaction
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from django.db.models.query import QuerySet
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from django.template.defaultfilters import slugify as default_slugify
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from django.utils.encoding import python_2_unicode_compatible
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from django.utils.translation import ugettext_lazy as _
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from django.utils.translation import ugettext
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from taggit.utils import _get_field
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try:
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from unidecode import unidecode
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except ImportError:
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unidecode = lambda tag: tag
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try:
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from django.contrib.contenttypes.fields import GenericForeignKey
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except ImportError: # django < 1.7
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from django.contrib.contenttypes.generic import GenericForeignKey
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try:
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atomic = transaction.atomic
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except AttributeError:
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from contextlib import contextmanager
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@contextmanager
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def atomic(using=None):
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sid = transaction.savepoint(using=using)
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try:
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yield
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except IntegrityError:
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transaction.savepoint_rollback(sid, using=using)
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raise
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else:
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transaction.savepoint_commit(sid, using=using)
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@python_2_unicode_compatible
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class TagBase(models.Model):
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name = models.CharField(verbose_name=_('Name'), unique=True, max_length=100)
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slug = models.SlugField(verbose_name=_('Slug'), unique=True, max_length=100)
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def __str__(self):
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return self.name
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class Meta:
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abstract = True
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def save(self, *args, **kwargs):
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if not self.pk and not self.slug:
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self.slug = self.slugify(self.name)
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from django.db import router
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using = kwargs.get("using") or router.db_for_write(
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type(self), instance=self)
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# Make sure we write to the same db for all attempted writes,
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# with a multi-master setup, theoretically we could try to
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# write and rollback on different DBs
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kwargs["using"] = using
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# Be oportunistic and try to save the tag, this should work for
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# most cases ;)
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try:
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with atomic(using=using):
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res = super(TagBase, self).save(*args, **kwargs)
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return res
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except IntegrityError:
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pass
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# Now try to find existing slugs with similar names
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slugs = set(
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self.__class__._default_manager
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.filter(slug__startswith=self.slug)
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.values_list('slug', flat=True)
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)
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i = 1
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while True:
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slug = self.slugify(self.name, i)
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if slug not in slugs:
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self.slug = slug
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# We purposely ignore concurrecny issues here for now.
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# (That is, till we found a nice solution...)
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return super(TagBase, self).save(*args, **kwargs)
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i += 1
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else:
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return super(TagBase, self).save(*args, **kwargs)
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def slugify(self, tag, i=None):
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slug = default_slugify(unidecode(tag))
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if i is not None:
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slug += "_%d" % i
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return slug
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class Tag(TagBase):
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class Meta:
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verbose_name = _("Tag")
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verbose_name_plural = _("Tags")
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@python_2_unicode_compatible
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class ItemBase(models.Model):
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def __str__(self):
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return ugettext("%(object)s tagged with %(tag)s") % {
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"object": self.content_object,
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"tag": self.tag
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}
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class Meta:
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abstract = True
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@classmethod
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def tag_model(cls):
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return _get_field(cls, 'tag').rel.to
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@classmethod
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def tag_relname(cls):
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return _get_field(cls, 'tag').rel.related_name
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@classmethod
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def lookup_kwargs(cls, instance):
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return {
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'content_object': instance
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}
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@classmethod
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def bulk_lookup_kwargs(cls, instances):
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return {
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"content_object__in": instances,
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}
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class TaggedItemBase(ItemBase):
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tag = models.ForeignKey(Tag, related_name="%(app_label)s_%(class)s_items", on_delete=models.CASCADE)
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class Meta:
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abstract = True
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@classmethod
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def tags_for(cls, model, instance=None, **extra_filters):
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kwargs = extra_filters or {}
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if instance is not None:
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kwargs.update({
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'%s__content_object' % cls.tag_relname(): instance
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})
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return cls.tag_model().objects.filter(**kwargs)
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kwargs.update({
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'%s__content_object__isnull' % cls.tag_relname(): False
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})
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return cls.tag_model().objects.filter(**kwargs).distinct()
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class CommonGenericTaggedItemBase(ItemBase):
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content_type = models.ForeignKey(
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ContentType,
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on_delete=models.CASCADE,
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verbose_name=_('Content type'),
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related_name="%(app_label)s_%(class)s_tagged_items"
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)
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content_object = GenericForeignKey()
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class Meta:
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abstract = True
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@classmethod
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def lookup_kwargs(cls, instance):
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return {
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'object_id': instance.pk,
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'content_type': ContentType.objects.get_for_model(instance)
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}
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@classmethod
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def bulk_lookup_kwargs(cls, instances):
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if isinstance(instances, QuerySet):
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# Can do a real object_id IN (SELECT ..) query.
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return {
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"object_id__in": instances,
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"content_type": ContentType.objects.get_for_model(instances.model),
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}
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else:
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# TODO: instances[0], can we assume there are instances.
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return {
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"object_id__in": [instance.pk for instance in instances],
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"content_type": ContentType.objects.get_for_model(instances[0]),
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}
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@classmethod
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def tags_for(cls, model, instance=None, **extra_filters):
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ct = ContentType.objects.get_for_model(model)
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kwargs = {
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"%s__content_type" % cls.tag_relname(): ct
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}
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if instance is not None:
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kwargs["%s__object_id" % cls.tag_relname()] = instance.pk
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if extra_filters:
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kwargs.update(extra_filters)
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return cls.tag_model().objects.filter(**kwargs).distinct()
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class GenericTaggedItemBase(CommonGenericTaggedItemBase):
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object_id = models.IntegerField(verbose_name=_('Object id'), db_index=True)
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class Meta:
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abstract = True
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if VERSION >= (1, 8):
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class GenericUUIDTaggedItemBase(CommonGenericTaggedItemBase):
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object_id = models.UUIDField(verbose_name=_('Object id'), db_index=True)
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class Meta:
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abstract = True
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class TaggedItem(GenericTaggedItemBase, TaggedItemBase):
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class Meta:
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verbose_name = _("Tagged Item")
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verbose_name_plural = _("Tagged Items")
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if django.VERSION >= (1, 5):
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index_together = [
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["content_type", "object_id"],
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]
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