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Class-based Generic Views: patterns and anti-patterns

Note

couldn't keep up with his code samples

Controversy

Blog posts last week

  • Luke Plant
  • Nick Coghlan

What are views in Django?

"A view is a callable that takes a requests and returns a response"

Deprecation

  • Functional views are not deprecated
  • Generic functional views are

Pre Django-1.3 Django CBVs

  • Admin
  • RSS feeds
  • Sitemaps

CBV API

class View(Object):

    @classonlymethod
    def as_view(cls, **init):
        def view(request, *args, **kwargs):
            self = cls(**init)
            return self.dispatch(request, *args, **kwargs)

    # TODO find the rest

Declarative vs Imperative

  • CBVs have a much steeper learning curve
  • ccbv.co.uk is a handy resource

Usage Tips for Django CBVs

  • try to keep urls.py for URL definition and nothing else
  • Keep decorators in views.oy

Decorating

# TODO show Python 2.7 version here

class MyView(generic.ListView):
    pass
# Complete this

MRO, extend, don't override

Unless you're 100% sure of what you're doing

Case Studies

Useful recipes

Form processing

TODO - get the form processing example

Nested Navigation

# TODO - get example

Pagination

# TODO - get example

Registration

from le_social.registration import views

class Register(views.Register):
    form_class = blah

# TODO get example

Settings

Don't set so many settings:

from le_social.registration import views

class Activate(views.Activate):
    expires_in = 3600 * 24 * 7 # 7 days

Shooting yourself in the foot

The problems with using CBVs

The 500 Error

class Handler500(generic.TemplateView):
    template_name = '500.html'

No matter what goes into this, it will throw out blank pages.