Adding a ManyToManyWidget to the reverse of a ManyToManyField in the Django Admin

Question

Let\'s say I have a simple blog app in Django 1.4:

class Post(models.Model):
    title = …
    published_on = …
    tags = models.ManyToManyField(\'Tag\')

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Answer 1

Modify your models to add reverse field:

# models.py
from django.db import models

class Post(models.Model):
    title = models.CharField(max_length=100)
    published_on = models.DateTimeField()
    tags = models.ManyToManyField('Tag')

class Tag(models.Model):
    name = models.CharField(max_length=10)
    posts = models.ManyToManyField('blog.Post', through='blog.post_tags')

Then in standard way add field to ModelAdmin:

#admin.py
from django.contrib import admin

class TagAdmin(admin.ModelAdmin):
    list_filter = ('posts', )

admin.site.register(Tag, TagAdmin)