django-admin-relation-links

Django Admin relation links

An easy way to add links to relations in the Django Admin site.

Preview

Imagine you have admin pages for 2 models: Member and Group. Member has a ForeignKey relation to Group.

• When you look at a member, you want to easily navigate to its group.
• When you look at a group, you want to easily navigate to a list of the members in that group.

With the help of this app you can easily create these links:

Member list page:

Member change page:

Group list page:

Group change page:

Install

pip install django-admin-relation-links

How to use

The links are placed on the change page of the model and go to the change list page or the change page of the related model, depending on whether the related model has a ForeignKey to this model or this model has a ForeignKey to the related model, or if it's a OneToOneField.

So for example, if you have these models:

from django.db import models


class Group(models.Model):
    name = models.CharField(max_length=200)


class Member(models.Model):
    name = models.CharField(max_length=200)
    group = models.ForeignKey(Group, related_name='members')

Then in the admin you can add links on the Group change page to the Member change list page (all the members of that group) and on the Member change page a link to the Group change page (the group of that member). Use the changelist_links and change_links fields:

from django.contrib import admin
from django_admin_relation_links import AdminChangeLinksMixin


@admin.register(Group)
class GroupAdmin(AdminChangeLinksMixin, admin.ModelAdmin):

    list_display = ['name']

    # Use the `related_name` of the `Member.group` field.
    # If you have no `related_name` specified on your model, use the default
    # `related_name` assigned by Django.
    changelist_links = ['members']

@admin.register(Member)
class MemberAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
    list_display = ['name']

    # Here we just specify the name of the `ForeignKey` field.
    change_links = ['group']

List page links

It is possible to show links on admin list page as well, using the field {field_name}_link:

@admin.register(Member)
class MemberAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
    list_display = ['name', 'group_link']  # Show link to group *change page* on member *list page*
    change_links = ['group']

Link label

By default, the label of the link is the string representation of the model instance. You can change the label by creating a method named {field_name}_link_label() like this:

    def group_link_label(self, group):
        return '{} ({} members)'.format(
            group.name,
            group.members.count()
        )

Extra options

You can also set extra options like label, model and lookup_filter like this:

@admin.register(Group)
class GroupAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
    list_display = ['name']
    changelist_links = [
        ('members', {
            'label': 'All members',  # Used as label for the link
            'model': 'Member',  # Specify a different model, you can also specify an app using `app.Member`
            'lookup_filter': 'user_group'  # Specify the GET parameter used for filtering the queryset
        })
    ]

List page ordering

When showing links on the list page, when you use that field for ordering, the default ordering field is the first field in the ordering option on the Meta class of the model of the related field. You can specify an alternative ordering like this:

@admin.register(Group)
class MemberAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
    list_display = ['name', 'group_link']
    change_links = [
        ('group', {
            'admin_order_field': 'group__name',  # Allow to sort members by `group_link` column
        })
    ]