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...
1 2 3 4 5 | from models import MyResource
@view_config(context=MyResource)
def my_view(context, request):
return render_view_to_response(context, request)
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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.
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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # models.py
from zope.interface import implements
from zope.interface import Interface
class IMyResource(Interface):
pass
class MyResource(object):
implements(IMyResource)
# views.py
from models import IMyResource
@view_config(context=IMyResource)
def my_view(context, request):
return render_view_to_response(context, request)
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