Rails-like MVC Controllers for Django

Author:: sciyoshi
Posted:: November 18, 2008
Language:: Python
Version:: 1.0
Score:: 1 (after 1 ratings)

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Allows using controllers for views.

This allows for nice subclassing to override behavior of views. Controller.urls (see below) works fine for subclasses as well.

Similar to snippet #1165 except that it won't break reverse URL resolving and regex validation in URLs.

In views.py:

import mvc

class MyController(mvc.Controller):
   @mvc.view('myview/$', 'myview')
   def my_view(self):
       # do something with self.request
       return HttpResponse('something')

   class Meta(mvc.Controller.Meta):
       url_prefix = 'mycontroller-'

In urls.py:

from . import views

urlpatterns = patterns('',
    # ... other urls here ...
    *views.MyController.urls(r'prefix/')
)

Then the view MyController.my_view will be accessible from 'prefix/myview/' and have the name 'mycontroller-myview', i.e. reverse('mycontroller-myview') will work as expected.

"""
Helpers for coding in a more MVC-fashion using Controller classes as opposed
to views.
"""

from django.shortcuts import get_object_or_404
from django.contrib.auth.decorators import login_required

def view(path=None, name=None):
    def decorator(func):
        func.view = True
        func.name = name if name is not None else func.__name__
        func.path = path if path is not None else '^%s/$' % func.name
        return func
    return decorator

class ControllerMetaclass(type):
    @property
    def _meta(self):
        return self.Meta

    def urls(self, path_prefix=''):
        return [
            (path_prefix + view.path, self.get_handler(view), {}, self._meta.url_prefix + view.name)
        for view in (getattr(self, name) for name in dir(self)) if getattr(view, 'view', False)]

class Controller(object):
    __metaclass__ = ControllerMetaclass

    def __init__(self, request, *args, **kwargs):
        self.request = request

    @classmethod
    def get_view(cls, view, request, *args, **kwargs):
        return view(cls(request), *args, **kwargs)

    @classmethod
    def get_handler(cls, view):
        def inner(request, *args, **kwargs):
            return cls.get_view(view, request, *args, **kwargs)
        return reduce(lambda func, dec: dec(func), cls._meta.decorators, inner)

    class Meta(object):
        url_prefix = ''
        decorators = []

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