PLEASE NOTE: The following explanation refers to Django v1.0 and is no longer fully applicable. Since DJango 1.1 or so, the request object is passed to ModelAdmin.formfield_for_dbfield and the new ModelAdmin.formfield_for_foreignkey by default, which makes this much simpler to accomplish.
I’m currently building a custom multi-blogging application in Django, and one of the challenges I ran into when developing the admin section was how to restrict users to seeing and editing only their own data.
Imagine the following (simplified) models:
owner = models.OneToOneField(User, primary_key=True)
title = models.CharField(max_length=32)
blog = models.ForeignKey(Blog)
slug = models.SlugField(max_length=255, db_index=True)
headline = models.CharField(max_length=255)
content = models.TextField()
If I want to show the …