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If I have a instance of an object, can I get the ID of a related object without needing to access the database? The value must be storred somewhere.
eg
book = Book.objects.get(id=1)
book.author.id
Django automatically creates a field for the id of the object by using the field name and suffixing it with _id eg:
It’s not very well documented in django’s docs but two blog posts on the matter for reference:
http://www.yilmazhuseyin.com/blog/dev/django-orm-performance-tips-part-2/
http://thebuild.com/blog/2010/12/22/getting-the-id-of-related-objects-in-django/