Django在管理员中过滤多对多字段？ [英] Django filter many to many field in admin?

问题描述

我有三个对象：

Thing
  some fields

Bucket
  things = models.ManyToManyField(Thing)

User
  buckets = models.ManyToManyField(Bucket)
  things = models.ManyToManyField(Thing)

在管理员中编辑 Bucket字段时，我希望能够选择事物，但只能选择事物中的事物。当前登录用户的内容列表。

When editing my "Bucket" field in the admin, I want to be able to select Things, but only those things that are in the "Things" list on the user currently logged in.

我该怎么做？换句话说，如何在Bucket管理员中过滤事物列表？

How can I do that? In other words, how can I filter the list of Things in the Bucket admin?

非常感谢您的提前帮助。

Thank you very much for your help in advance.

推荐答案

有一个 formfield_for_manytomany 。用法类似于defuz给出的答案。

There is a formfield_for_manytomany. Usage is similar to the answer given by defuz.

ModelAdmin.formfield_for_manytomany(db_field, request, **kwargs)¶

就像 formfield_for_foreignkey 方法一样，可以覆盖 formfield_for_manytomany 方法，以将
默认表单字段更改为多对多字段。例如，如果所有者
可以拥有多辆汽车，并且汽车可以属于多个所有者-多个
对许多关系-您可以将汽车外键字段过滤为
，仅显示拥有的汽车由用户：

Like the formfield_for_foreignkey method, the formfield_for_manytomany method can be overridden to change the default formfield for a many to many field. For example, if an owner can own multiple cars and cars can belong to multiple owners – a many to many relationship – you could filter the Car foreign key field to only display the cars owned by the User:

class MyModelAdmin(admin.ModelAdmin):
    def formfield_for_manytomany(self, db_field, request, **kwargs):
        if db_field.name == "cars":
            kwargs["queryset"] = Car.objects.filter(owner=request.user)
        return super(MyModelAdmin, self).formfield_for_manytomany(db_field, request, **kwargs)

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