我有mixin和model:
class Mixin(object):
field = GenericRelation('ModelWithGR')
class MyModel(Mixin, models.Model):
...
但是django不会将GenericRelation
字段转换为GenericRelatedObjectManager
:
>>> m = MyModel()
>>> m.field
<django.contrib.contenttypes.fields.GenericRelation>
当我将字段放入模型本身或抽象模型时 - 它工作正常:
class MyModel(Mixin, models.Model):
field = GenericRelation('ModelWithGR')
>>> m = MyModel()
>>> m.field
<django.contrib.contenttypes.fields.GenericRelatedObjectManager at 0x3bf47d0>
如何在mixin中使用GenericRelation
?
答案 0 :(得分:6)
您始终可以继承Model
并将其设为摘要,而不是从object
继承。 Python的mro会解决所有问题。
像这样:
class Mixin(models.Model):
field = GenericRelation('ModelWithGR')
class Meta:
abstract = True
class MyModel(Mixin, models.Model):
...