SingleObjectMixin with ListView - querysets

[KenWhitesell]

@101is5

How is it a list of books? All methods seem to work based on a queryset of Publisher, even the third one, get_queryset(), which returns the list of books but through the queryset from get();

You’re on the right track. Let’s break this down:

@101is5

self.object.book_set.all()

self.object is a reference to a Publisher.
self.object.book_set is a reference to a Manager.

• What is it a Manager for?
  • It’s for all the books that are related to the Publisher.
    Therefore - self.object.book_set.all() is the queryset returning all books related to the Publisher.
    Functionally, it’s no different than Book.objects.filter(publisher=publisher_id)

The get method of ListView has the line:
self.object_list = self.get_queryset()

@101is5

Where does this class get to infer the model?

See get_template_names

@101is5

Does the order in which parent classes are provided influence who gets to perform which method? Both SingleObjectMixin and ListView have the methods defined above, so who gets to execute what?

See the Python topic “Method Resolution Order” among others. (A search will find many blogs explaining this topic.)

Also, two resources I’ve found extremely useful for understanding the generic CBVs are:

• CCBV
• CBV diagrams