42 lines
1.9 KiB
Python
42 lines
1.9 KiB
Python
from django.conf import settings
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from django.db import models
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from django.db.models.fields import FieldDoesNotExist
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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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def __init__(self, field_name=None):
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super(CurrentSiteManager, self).__init__()
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self.__field_name = field_name
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self.__is_validated = False
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def _validate_field_name(self):
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field_names = self.model._meta.get_all_field_names()
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# If a custom name is provided, make sure the field exists on the model
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if self.__field_name is not None and self.__field_name not in field_names:
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raise ValueError("%s couldn't find a field named %s in %s." % \
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(self.__class__.__name__, self.__field_name, self.model._meta.object_name))
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# Otherwise, see if there is a field called either 'site' or 'sites'
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else:
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for potential_name in ['site', 'sites']:
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if potential_name in field_names:
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self.__field_name = potential_name
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self.__is_validated = True
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break
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# Now do a type check on the field (FK or M2M only)
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try:
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field = self.model._meta.get_field(self.__field_name)
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if not isinstance(field, (models.ForeignKey, models.ManyToManyField)):
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raise TypeError("%s must be a ForeignKey or ManyToManyField." %self.__field_name)
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except FieldDoesNotExist:
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raise ValueError("%s couldn't find a field named %s in %s." % \
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(self.__class__.__name__, self.__field_name, self.model._meta.object_name))
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self.__is_validated = True
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def get_queryset(self):
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if not self.__is_validated:
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self._validate_field_name()
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return super(CurrentSiteManager, self).get_queryset().filter(**{self.__field_name + '__id__exact': settings.SITE_ID})
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