Upload File

class-based views with django

23
Class-based views with Django Simon Willison DJUGL, 7th April 2009

Upload: simon-willison

Post on 07-Nov-2014

18.771 views

Category:

Technology


6 download

Report

Tags:

DESCRIPTION

Talk given at DJUGL in London on the 7th April 2009

TRANSCRIPT

  • 1. Class-based views with Django Simon Willison DJUGL, 7th April 2009
  • 2. Reusability A guiding principle of Django Build applications, not projects Generic views Thriving third party ecosystem
  • 3. The Django contract A Django view is a function that takes a request object and returns a response object ORM, middleware, template language, forms, authentication system, admin, sites etc are all optional extras
  • 4. Generic views Encapsulate common patterns in web development List of things / page about each things Things that are archived by date Things you can create/update/delete Lets look at the code for object_detail
  • 5. object_detail drawbacks You cant swap the ORM for something else (without duck typing your own queryset) You have to use RequestContext You cant modify something added to the context; you can only specify extra_context Thats despite a great deal of effort going in to making the behaviour customisable
  • 6. newforms-admin De-coupled admin from the rest of Django Admin is just another application A new approach to customisation Powerful subclassing pattern
  • 7. Finely grained permissions class Entry(models.Model): title = models.CharField(max_length=255) author = models.ForeignKey('auth.User') class EntryAdmin(admin.ModelAdmin): exclude = ('author',) def queryset(self, request): queryset = super(EntryAdmin, self).queryset(request) return queryset.filter(author = request.user) def save_model(self, request, obj, form, change): obj.author = request.user obj.save() def has_change_permission(self, request, ojb=None): if not obj: return True # access to change list return obj.author == request.user has_delete_permission = has_change_permission admin.site.register(Entry, EntryAdmin)
  • 8. Finely grained permissions class Entry(models.Model): title = models.CharField(max_length=255) author = models.ForeignKey('auth.User') class EntryAdmin(admin.ModelAdmin): exclude = ('author',) def queryset(self, request): queryset = super(EntryAdmin, self).queryset(request) return queryset.filter(author = request.user) def save_model(self, request, obj, form, change): obj.author = request.user obj.save() def has_change_permission(self, request, ojb=None): if not obj: return True # access to change list return obj.author == request.user has_delete_permission = has_change_permission admin.site.register(Entry, EntryAdmin)
  • 9. Finely grained permissions class Entry(models.Model): title = models.CharField(max_length=255) author = models.ForeignKey('auth.User') class EntryAdmin(admin.ModelAdmin): exclude = ('author',) def queryset(self, request): queryset = super(EntryAdmin, self).queryset(request) return queryset.filter(author = request.user) def save_model(self, request, obj, form, change): obj.author = request.user obj.save() def has_change_permission(self, request, ojb=None): if not obj: return True # access to change list return obj.author == request.user has_delete_permission = has_change_permission admin.site.register(Entry, EntryAdmin)
  • 10. Finely grained permissions class Entry(models.Model): title = models.CharField(max_length=255) author = models.ForeignKey('auth.User') class EntryAdmin(admin.ModelAdmin): exclude = ('author',) def queryset(self, request): queryset = super(EntryAdmin, self).queryset(request) return queryset.filter(author = request.user) def save_model(self, request, obj, form, change): obj.author = request.user obj.save() def has_change_permission(self, request, ojb=None): if not obj: return True # access to change list return obj.author == request.user has_delete_permission = has_change_permission admin.site.register(Entry, EntryAdmin)
  • 11. Finely grained permissions class Entry(models.Model): title = models.CharField(max_length=255) author = models.ForeignKey('auth.User') class EntryAdmin(admin.ModelAdmin): exclude = ('author',) def queryset(self, request): queryset = super(EntryAdmin, self).queryset(request) return queryset.filter(author = request.user) def save_model(self, request, obj, form, change): obj.author = request.user obj.save() def has_change_permission(self, request, ojb=None): if not obj: return True # access to change list return obj.author == request.user has_delete_permission = has_change_permission admin.site.register(Entry, EntryAdmin)
  • 12. Finely grained permissions class Entry(models.Model): title = models.CharField(max_length=255) author = models.ForeignKey('auth.User') class EntryAdmin(admin.ModelAdmin): exclude = ('author',) def queryset(self, request): queryset = super(EntryAdmin, self).queryset(request) return queryset.filter(author = request.user) def save_model(self, request, obj, form, change): obj.author = request.user obj.save() def has_change_permission(self, request, ojb=None): if not obj: return True # access to change list return obj.author == request.user has_delete_permission = has_change_permission admin.site.register(Entry, EntryAdmin)
  • 13. Objects can be views A Django view is a function that takes a request object and returns a response object A Django view is a callable that takes a request object and returns a response object
  • 14. Objects can be views A Django view is a function that takes a request object and returns a response object A Django view is a callable that takes a request object and returns a response object Just dene __call__() on the class
  • 15. Example: restview.py http://www.djangosnippets.org/snippets/1071/
  • 16. django_openid Next generation of my django-openid project Taken a lot longer than I expected Extensive use of class-based customisation
  • 17. Ideas from django_openid Everything should go through a render() method Every template inherits from base_template Every decision should be a method Every form should come from a method Every model interaction should live in a method
  • 18. TemplateResponse If you render_to_response, a subclass cant override and reuse your method while modifying the context or template Solution: return TemplateResponse( request, 'article.html', context ) auth.py line 65
  • 19. Class-based generic views Ticket #6735 Didnt quite make 1.1; scheduled for 1.2
  • 20. Subclassable decorators ratelimitcache is a decorator that implements rate limiting for a Django view Its a class disguised as a function, using the __call__ method You can subclass it to customise its behaviour http://github.com/simonw/ratelimitcache/tree/master
  • 21. Extending the contract Django view: take request / return response Django middleware: take request / return response Django application: take request / return response Django urlconf: take request / return response Django site: take request / return response
  • 22. Thank you

Computer Orange Template - MYKVS.INpython.mykvs.in/presentation/class xii/computer science... · 2019-04-13 · Django Visit : python.mykvs.in for regular updates Django is an open

Django-nonrel Documentation - Read the Docs · Django-nonrel Documentation, Release 0 Internals Django-nonrel is based on Django 1.3. The modifications to Django are minimal (maybe

Django Rest Framework vs Django TastyPie

WHERE DRAMATIC VIEWS ARE MATCHED BY WORLD-CLASS

Django class based views for beginners

Chapter 1: Developing RESTful APIs and Microservices with ...€¦ · [ 17 ] Chapter 6: Working with Class-Based Views and Hyperlinked APIs in Django 2.1

Getting Started With Django: A Crash Course … › pdf › gswd-a-crash-course...Getting Started With Django: A Crash Course Documentation, Release 1.0 Auth views HomeView Before

Computer Orange Template - MYKVS.INpython.mykvs.in/presentation/class xii/informatics practices/web application... · Django Visit : python.mykvs.in for regular updates Django is

Curso de Django | Django Course

django-dashing Documentation...django-dashing Documentation, Release 0.2 Django Settings Configuration for Django Dashing is all namespaced inside a single Django setting, named DASHING

CLASS-XII COMPUTER SCIENCE-PYTHON (083) …...Here, Meta class is simply an inner class. In Django, the use of Meta class is simply to provide metadata to the ModelForm class. Django

django-cruds-adminlte Documentation · django-cruds-adminlte django-cruds-adminlteis simple drop-in django app that creates CRUD (Create, read, update and delete) views for existing

Building APIs with Django and Django Rest Framework...Building APIs with Django and Django Rest Framework, Release 2.0 Building APIs with Django and DRF takes over where the Django

Ch9 .Best Practices for Class-Based Views

Django urls · Django Girls Tutorial · tutorial.djangogirls.org Django views – time to create! · Django Girls Tutorial DjangoGirls 2-3 minuti Time to get rid of the bug we created

Why Python is best for Django?, Job trends in Django, Learn Django Online

Introduction to Django - OSCON 2012 - O'Reilly Mediaassets.en.oreilly.com/1/event/80/Introduction to Django... · Django Training. Section 1: Introduction to Django. 1 “ ” Django

Django Meetup: Django Multicolumn Joins

Django class-based views: survival guide for novices

Django Daguerre Documentation...Django Daguerre Documentation, Release 3.0.0 2.1.1Built-In Adjustments class daguerre.adjustments.Fit(**kwargs) Resizes an image to fit entirely within

Django - Sevenmentor Pvt. Ltd · 2019-08-20 · Django Prerequisite: Introduction to HTML5, CSS3 and Bootstrap Django Framework Introduction to Django Installing Django Setting up

django-bootstrap3 Documentation - Read the Docs · django-bootstrap3 Documentation, Release 11.0.0 default ''. Can be changed Settings bound_css_class CSS class used when the field

Quick Reference Guide to DJANGO TERMINAL COMMANDS · INSTALL DJANGO INSIDE VIRTUALENV: pip install django (pip install django==2.04 to install a specific version of django) START

Student Views of Class Projects as Learning Experiences

Without Django - Pocoomitsuhiko.pocoo.org/django-without-django.pdf · Without Django applying django principles to non django projects. I Love Django ‣ Using Django since the very

Release 0.7.2 Artur Barseghyan  · django-slim Documentation, Release 0.7.2 class Meta abstract = False 7.3 fields Module class slim.models.fields.LanguageField(*args,

COUV NOTICE DJANGO-01C - media-ct-ndp.peugeot.com · Django 50 cc Moteur 2 temps Django 50 cc Moteur 4 temps Django 125 cc Django 150 cc Django 150i Dimensions pneumatiques Avant

Django Book ch8 Advanced Views and URLconf

django-common-configs Documentation...django-common-configs Documentation, Release 0.1.0.dev1 MozillaCSP class common_configs.django.security.MozillaCSP Mozilla Content Security

Django Facebook Documentation - media.readthedocs.orgmedia.readthedocs.org/pdf/django-facebook/latest/django-facebook.pdf · Django Facebook enables your users to easily register

Django Jobs | Django developers | Freelance Jobs

Django Class-based views (Slovenian)

Class Based Generic Views в Django

Django Introduction - Catalyst Introduction_2.… · • The use of the Django ORM and database model API • Writing views (web-pages) in Django, both from scratch and using the

Django: Views, Templates, and Sessions - Emory University · Agenda Warm-up project: Anything you are missing? Progress or problems? Post on Piazza. Still due Feb 13th Today: Django