view-callable class - request arg receives context object - pylons-discuss

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Subject: Re: view-callable class - request arg receives context object
From: Simon Yarde <simonya...@me.com>
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Date: Wed, 31 Oct 2012 17:26:34 +0000
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Understood - thanks for clarifying. Best, S

On 31 Oct 2012, at 17:12, Michael Merickel wrote:

> 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.
> 
> On Wed, Oct 31, 2012 at 12:07 PM, Simon <simonya...@me.com> wrote:
>> 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')
>> 
>> 
>> 
>> On Wednesday, October 31, 2012 4:07:42 PM UTC, Michael Merickel wrote:
>>> 
>>> 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
>>> 
>>> On Wed, Oct 31, 2012 at 11:02 AM, Simon Yarde <simon...@me.com> wrote:
>>>> 
>>>> 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'>
>>>> 
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