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Have is_list_view recognise RetrieveModel… views #5480


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@carltongibson carltongibson commented Oct 5, 2017

Fixes #5165

Adds isinstance check for RetrieveModelMixin. Useful when you've routed a view to a URL without a lookup parameter. e.g. /accounts/profile/ which pulls its object (the current user) from the request.

@carltongibson carltongibson added this to the 3.7.0 Release milestone Oct 5, 2017
@carltongibson carltongibson requested a review from tomchristie Oct 5, 2017
@carltongibson carltongibson merged commit 2edeb74 into encode:master Oct 5, 2017
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@carltongibson carltongibson deleted the 37/is-list-recognise-retrieve-view branch Oct 5, 2017
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matteius commented Oct 5, 2017

Just curious if the schema ever inspects a view that is called .as_view() from a URL? The reason I never got that fully working before I think is my test was on a view that was referenced this way, so the as_view() version couldn't resolve that it was an instance of the RetrieveModelMixin. Just curious, thanks!

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carltongibson commented Oct 5, 2017

@matteius Hi. Yes, I looked again at your test case today. I noticed the as_view() — which isn't right, so why it didn't work.

as_view() returns a callback that takes a request, instantiates a view instance, calls dispatch on it and returns the response.

Calling isinstance on this callback (obviously, once you've seen it) doesn't give the result we're after. We need the view inside the wrapper.

SchemaGenerator has a whole method for mapping callbacks back to views:

def create_view(self, callback, method, request=None):
Given a callback, return an actual view instance.
view = callback.cls()
for attr, val in getattr(callback, 'initkwargs', {}).items():
setattr(view, attr, val)
view.args = ()
view.kwargs = {}
view.format_kwarg = None
view.request = None
view.action_map = getattr(callback, 'actions', None)
actions = getattr(callback, 'actions', None)
if actions is not None:
if method == 'OPTIONS':
view.action = 'metadata'
view.action = actions.get(method.lower())
if request is not None:
view.request = clone_request(request, method)
return view

It's this that we inspect to generate the schema.

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matteius commented Oct 5, 2017

Oh wow, so its a solved problem then 💯 Thanks for helping me understand the existing code base better!

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2 participants