Using Traversal in Pyramid Views

A trivial example of how to use traversal in your view code.

You may remember that a Pyramid view is called with a context argument.

def my_view(context, request):
    return render_view_to_response(context, request)

When using traversal, context will be the resource object that was found by traversal. Configuring which resources a view responds to can be done easily via either the @view.config decorator.

1from models import MyResource
4def my_view(context, request):
5    return render_view_to_response(context, request)

or via config.add_view:

from models import MyResource
config = Configurator()
config.add_view('myapp.views.my_view', context=MyResource)

Either way, any request that triggers traversal and traverses to a MyResource instance will result in calling this view with that instance as the context argument.

Optional: Using Interfaces

If your resource classes implement interfaces, you can configure your views by interface. This is one way to decouple view code from a specific resource implementation.

 2from zope.interface import implements
 3from zope.interface import Interface
 5class IMyResource(Interface):
 6    pass
 8class MyResource(object):
 9    implements(IMyResource)
12from models import IMyResource
15def my_view(context, request):
16    return render_view_to_response(context, request)

See Also