I have some models setup that allows users to have an inventory of
items: books and movies. These are setup as inherited models.
What I would like to do is allow a user to select a current book and a
current movie, but only from "valid" options in that user's inventory.
What I mean by valid is that a user should not be able to select a
book as their current movie, or a movie as their current book.
Here is what I have so far. This works, except that it does not limit
the user to what is in their inventory, nor does it validate that the
current_book is actually a book.
Any thoughts or ideas of how to achieve this?
class Profile(models.Model):
user = models.ForeignKey("auth.User", verbose_name="User",
unique=True)
# These are the two lines that are not correct
current_book = models.ForeignKey("Inventory", blank=True,
null=True, verbose_name="Current Book",
related_name="profile_current_books")
current_movie = models.ForeignKey("Inventory", blank=True,
null=True, verbose_name="Current Movie",
related_name="profile_current_movies")
class Item(models.Model):
name = models.CharField("Name", max_length=60)
description = models.TextField("Description", blank=True,
null=True)
class Book(Item):
pages = models.PositiveIntegerField("Pages")
class Movie(Item):
minutes = models.PositiveIntegerField("Minutes")
class Inventory(models.Model):
item = models.ForeignKey("Item", verbose_name="Item")
profile = models.ForeignKey("Profile", verbose_name="Profile")
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