Avoid boring views and urls.
When having a look at Ruby on Rails, I discovered a nice feature that was missing in Django: controllers. Contrary to what I often read, views in Django are not really equivalent to controllers in Rails. A Rails controller basically is a set of Django views and Django URL patterns. Apart from driving off boring URL work, this is a clean way to group views that belongs to the same model.
Any good djangonaut would make the connection with generic views − especially class-based. This is the easiest solution to avoid repeating the same code with a few changes. But this is not simplifying URL patterns and we often have to define such files:
# views.py from django.views.generic import ListView, DetailView # and so on… from .models import Example class ExampleListView(ListView): model = Example class ExampleDetailView(DetailView): model = Example # and so on…
# urls.py from django.conf.urls import patterns, url from .views import * urlpatterns = patterns('', url('^examples/$', ExampleListView.as_view(), name='example_index'), url('^examples/(?P<pk>\d+)$', ExampleDetailView.as_view(), name='example_detail'), # and so on… )
With a single model, this looks easy. With complex applications containing dozens of models, this looks painful − and definitely not DRY .
django-viewsets proposes a solution inspired of Rails controllers. ViewSet is a class that builds a set of URL patterns from a set of class-based generic views. It is designed to be overridable, so that it fits standard as well as advanced use.
[sudo] pip install django-viewsets
You don’t have to change your project settings.py.
|Generic view||URL||URL name|
In your application (or project) urls.py:
from django.conf.urls import patterns, url, include from viewsets import ModelViewSet from .models import YourModel urlpatterns = patterns('', url('', include(ModelViewSet(YourModel).urls)), )
You can also provide other basic attributes as keyword arguments. For example, if you want to use slugs instead of primary keys in URL patterns, lines 2 and 6 become:
from viewsets import ModelViewSet, SLUG # line 2 url('', include(ModelViewSet(YourModel, id_pattern=SLUG).urls)), # line 6
This allow more customization.
In your application views.py:
from viewsets import ModelViewSet from .models import YourModel class YourModelViewSet(ModelViewSet): model = YourModel
In your application (or project) urls.py:
from django.conf.urls import patterns, url, include from .views import YourModelViewSet urlpatterns = patterns('', url('', include(YourModelViewSet().urls)), )
What is interesting in this use is that you can easily customize views and urls. Let’s say you want to use primary keys in update and delete url patterns, but you want to use slugs in detail view. The fastest way to do it is:
from viewsets import ModelViewSet, SLUG class CustomModelViewSet(ModelViewSet): def __init__(self, *args, **kwargs): self.views['detail_view']['pattern'] = SLUG super(CustomModelViewSet, self).__init__(*args, **kwargs)
Here we don’t set the model attribute, so that CustomModelViewSet can be used for any of your models. Of course, you can now use CustomModelViewSet with basic use as well as Advanced use. And we could have set model, if this viewset was meant to be used only with a specific model.
- The model class from which ModelViewSet will create views and urls. This is the only mandatory attribute.
- Overrides your-models in all URL patterns. Calculated from model._meta.verbose_name_plural if unset.
- Overrides your-model in all URL names. Calculated from model._meta.verbose_name if unset.
- Overrides [pk] in all URL patterns. You can either use viewsets.PK or viewsets.SLUG.
- A sequence of keys from the views. Unset by default. Example: ('create_view', 'delete_view',).
- Set this if your application has a URL namespace. It is used to redirect to main_view in delete_view. You can also set main_url.
- Used to calculate main_url. 'list_view' by default.
- The main url where delete_view redirects. If set, main_view is ignored.
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