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61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
5 years ago
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from django.conf import settings
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from django.core import checks
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from django.core.exceptions import FieldDoesNotExist
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from django.db import models
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class CurrentSiteManager(models.Manager):
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"Use this to limit objects to those associated with the current site."
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use_in_migrations = True
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def __init__(self, field_name=None):
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super().__init__()
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self.__field_name = field_name
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def check(self, **kwargs):
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errors = super().check(**kwargs)
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errors.extend(self._check_field_name())
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return errors
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def _check_field_name(self):
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field_name = self._get_field_name()
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try:
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field = self.model._meta.get_field(field_name)
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except FieldDoesNotExist:
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return [
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checks.Error(
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"CurrentSiteManager could not find a field named '%s'." % field_name,
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obj=self,
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id='sites.E001',
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)
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]
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if not field.many_to_many and not isinstance(field, (models.ForeignKey)):
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return [
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checks.Error(
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"CurrentSiteManager cannot use '%s.%s' as it is not a foreign key or a many-to-many field." % (
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self.model._meta.object_name, field_name
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),
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obj=self,
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id='sites.E002',
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)
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]
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return []
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def _get_field_name(self):
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""" Return self.__field_name or 'site' or 'sites'. """
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if not self.__field_name:
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try:
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self.model._meta.get_field('site')
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except FieldDoesNotExist:
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self.__field_name = 'sites'
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else:
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self.__field_name = 'site'
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return self.__field_name
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def get_queryset(self):
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return super().get_queryset().filter(**{self._get_field_name() + '__id': settings.SITE_ID})
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