获取所有相关的Django模型对象 [英] Get all related Django model objects
问题描述
如何获取所有具有指向对象的ForeignKey的模型对象的列表? (类似于DELETE CASCADE之前的Django管理员中的删除确认页面)。
我试图提出一种在数据库中合并重复对象的通用方法。基本上,我想要所有具有ForeignKeys的对象指向B来更新以指向对象A,所以我可以删除B,而不会丢失任何重要的东西。
$ b $感谢您的帮助!
Django< = 1.7
这给你所有相关对象的属性名称:
links = [rel.get_accessor_name()for rel a._meta.get_all_related_objects()]
然后可以使用这样的东西来获取所有相关对象:
链接中的链接:
objects = getattr(a,link).all()
对象中的对象:
#执行相关对象实例
我花了一段时间尝试这样做,所以我可以在
上实现一种观察者模式,我的一个模型。希望这是有帮助的。
Django 1.8 +
使用 _meta.get_fields() / code>: https://docs.djangoproject.com/en/1.10/ref/models/meta/#django.db.models.options.Options.get_fields (参见
_get_fields中的相反()
source))
How can I get a list of all the model objects that have a ForeignKey pointing to an object? (Something like the delete confirmation page in the Django admin before DELETE CASCADE).
I'm trying to come up with a generic way of merging duplicate objects in the database. Basically I want all of the objects that have ForeignKeys points to object "B" to be updated to point to object "A" so I can then delete "B" without losing anything important.
Thanks for your help!
Django <= 1.7
This gives you the property names for all related objects:
links = [rel.get_accessor_name() for rel in a._meta.get_all_related_objects()]
You can then use something like this to get all related objects:
for link in links:
objects = getattr(a, link).all()
for object in objects:
# do something with related object instance
I spent a while trying to figure this out so I could implement a kind of "Observer Pattern" on one of my models. Hope it's helpful.
Django 1.8+
Use _meta.get_fields()
: https://docs.djangoproject.com/en/1.10/ref/models/meta/#django.db.models.options.Options.get_fields (see reverse in the _get_fields()
source also)
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