How to show related objects in Django/Admin?

Question

I have 2 models:

from django.db import models  class Category(models.Model):     icon = models.ImageField(upload_to = 'thing/icon/')     image = models.ImageField(upload_to = 'thing/image/')     created_at = models.DateTimeField(auto_now_add=True)     updated_at = models.DateTimeField(auto_now=True)     title = models.CharField(max_length=200)     slug = models.SlugField()     desc = models.TextField(max_length=1000)      def __str__(self):         return self.title      def __unicode__(self):         return self.title  class Thing(models.Model):     icon = models.ImageField(upload_to = 'thing/icon/')     image = models.ImageField(upload_to = 'thing/image/')     created_at = models.DateTimeField(auto_now_add=True)     updated_at = models.DateTimeField(auto_now=True)     title = models.CharField(max_length=200)     slug = models.SlugField()     desc = models.TextField(max_length=1000)     content = models.TextField()     category = models.ForeignKey('Category')      def __str__(self):         return self.title      def __unicode__(self):         return self.title 

I am using Django's admin site for basic CRUD operations. I need to show all Things in Category if I am selecting an Category in admin.

Answer 1

You can use "Inlines" to visualize and edit Things of a certain Category in the admin detail for that category:

In the admin.py file, create an Inline object for Thing (ThingInline) and modify your CategoryAdmin class to have an inline of type ThingInline like this:

... class ThingInline(admin.TabularInline):     model = Thing  class CategoryAdmin(admin.ModelAdmin):     inlines = [         ThingInline,     ] ... 

For further details, this is the docs for admin inlines: https://docs.djangoproject.com/en/dev/ref/contrib/admin/#inlinemodeladmin-objects

Answer 2

update admin.py file like this.

from django.contrib import admin from .views import Category, Thing  class CategoryAdmin(admin.ModelAdmin):     inlines = [         ThingInline,     ]  class ThingInline(admin.TabularInline):     model = Thing  admin.site.register(Category, CategoryAdmin)  admin.site.register(Thing) 

There are two inline options TabularInline and StackedInline