68 lines
2.5 KiB
Python
68 lines
2.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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The manager class for use in the models.
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"""
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from __future__ import unicode_literals
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import warnings
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from django.db import models
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from django.utils.six import python_2_unicode_compatible
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from polymorphic.query import PolymorphicQuerySet
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__all__ = (
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'PolymorphicManager',
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'PolymorphicQuerySet',
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)
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@python_2_unicode_compatible
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class PolymorphicManager(models.Manager):
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"""
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Manager for PolymorphicModel
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Usually not explicitly needed, except if a custom manager or
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a custom queryset class is to be used.
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"""
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# Tell Django that related fields also need to use this manager:
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use_for_related_fields = True
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queryset_class = PolymorphicQuerySet
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@classmethod
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def from_queryset(cls, queryset_class, class_name=None):
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manager = super(PolymorphicManager, cls).from_queryset(queryset_class, class_name=class_name)
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manager.queryset_class = queryset_class # also set our version, Django uses _queryset_class
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return manager
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def __init__(self, queryset_class=None, *args, **kwrags):
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# Up till polymorphic 0.4, the queryset class could be specified as parameter to __init__.
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# However, this doesn't work for related managers which instantiate a new version of this class.
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# Hence, for custom managers the new default is using the 'queryset_class' attribute at class level instead.
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if queryset_class:
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warnings.warn("Using PolymorphicManager(queryset_class=..) is deprecated; override the queryset_class attribute instead", DeprecationWarning)
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# For backwards compatibility, still allow the parameter:
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self.queryset_class = queryset_class
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super(PolymorphicManager, self).__init__(*args, **kwrags)
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def get_queryset(self):
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qs = self.queryset_class(self.model, using=self._db, hints=self._hints)
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if self.model._meta.proxy:
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qs = qs.instance_of(self.model)
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return qs
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def __str__(self):
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return '%s (PolymorphicManager) using %s' % (self.__class__.__name__, self.queryset_class.__name__)
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# Proxied methods
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def non_polymorphic(self):
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return self.all().non_polymorphic()
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def instance_of(self, *args):
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return self.all().instance_of(*args)
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def not_instance_of(self, *args):
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return self.all().not_instance_of(*args)
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def get_real_instances(self, base_result_objects=None):
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return self.all().get_real_instances(base_result_objects=base_result_objects)
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