django-polymorphic-ng 0.8.0

Django的多态模型

Django-polymorphic简化了在Django项目中使用继承模型的过程。当对基础模型进行查询时，会返回继承的模型类。

当我们存储继承自Project模型的模型...

>>> Project.objects.create(topic="Department Party")
>>> ArtProject.objects.create(topic="Painting with Tim", artist="T. Turner")
>>> ResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")

...并且想要检索所有项目，会返回子类化的模型！

>>> Project.objects.all()
    [ <Project:         id 1, topic "Department Party">,
      <ArtProject:      id 2, topic "Painting with Tim", artist "T. Turner">,
      <ResearchProject: id 3, topic "Swallow Aerodynamics", supervisor "Dr. Winter"> ]

使用纯Django，我们得到的是基础类对象，这很少是我们想要的

>>> Project.objects.all()
    [ <Project: id 1, topic "Department Party">,
      <Project: id 2, topic "Painting with Tim">,
      <Project: id 3, topic "Swallow Aerodynamics"> ]

当通过外键、多对多字段或一对一字段访问多态模型时，这也同样适用。

许可证

Django-polymorphic使用与Django相同的许可证（BSD-like）。