view-callable class - request arg receives context object

[Simon Yarde]

Docs say you should expect to handle a request argument in a view-callable class.

http://pyramid.readthedocs.org/en/latest/narr/views.html#defining-a-view-callable-as-a-class

But I found I was getting a context object for the request arg.

Does this mean context and request are being passed (in that order) as positional args, rather can keywords?

I know I can just reverse the order so context is first - just asking if there is anything wrong with below code that would cause this, or this is view-callables are called this way for any reason?


class SomeView():
"""
"""
def __init__(self,
request, # called positionally?
context, # ..
*args,
**kwargs
):
print('"request" is {0}'.format(request.__class__))
print('"context" is {0}'.format(context.__class__))


"request" is <class 'pyramid.traversal.DefaultRootFactory'>
"context" is <class 'pyramid.util.Request'>

[Michael Merickel]

They are called positionally via introspection and not by name. The
calling convention is here:

http://pyramid.readthedocs.org/en/latest/narr/views.html#alternate-view-callable-argument-calling-conventions

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[Simon]

Thanks Michael

Is the example below given in #defining-a-view-callable-as-a-class incorrect?

I.e. ``request`` is a context-object because it is the first-position arg.

from pyramid.response import Response

class MyView(object):

    def __init__(self, request):

        self.request = request

    def __call__(self):

        return Response('hello')

[Michael Merickel]

No, it's correct. As I said it uses introspection to see what args are
there. If your function takes 1 arg, it will be the request. If it
takes 2 or more args the first two will be context and request in that
order. You need to be aware of this if you try to do (request, *args)
because the first arg will be context and args[0] will be request.

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[Simon Yarde]

Understood - thanks for clarifying. Best, S