How to use the same context variables in a number of class-based views

Question

I'd like use the same context variables in a number of class-based views, and using my rudimentary knowledge of Python I've done this by making a superclass and using multiple inheritance:

class ContextCommonToManyViews():
    def addToContext(self, context): 
        context['form'] = FormForManyPages()
        context['username'] = self.request.user.username
        context['available_in_many_views'] = something
        return context

class ViewA(ListView, ContextCommonToManyViews):
    model = ModelA

    def get_context_data(self, **kwargs):
        context = super(ViewA, self).get_context_data(**kwargs)
        context = self.addToContext(context)
        context['specific_to_view'] = 'ViewA here'
        return context

class ViewB(ListView, ContextCommonToManyViews):
    model = ModelB

    def get_context_data(self, **kwargs):
        context = super(ViewB, self).get_context_data(**kwargs)
        context = self.addToContext(context)
        context['specific_to_view'] = 'ViewB here'
        return context

Is there a better way?

Everything seems fine to me. You can use context.update(self.addToContext()) instead of context = self.addToContext(context). — Serhii Holinei
– Serhii Holinei, Commented Oct 1, 2012 at 17:09

dokkaebi · Accepted Answer · 2012-10-01 21:19:27Z

1

A mixin like this might be cleaner:

class ContextCommonToManyViews(object):
    def get_context_data(self, request, **kwargs):
        context = super(ContextCommonToManyViews, self).get_context_data(request, **kwargs)
        context['form'] = FormForManyPages()
        context['username'] = self.request.user.username
        context['available_in_many_views'] = something
        return context

class ViewA(ContextCommonToManyViews, ListView):
    model = ModelA

class ViewB(ContextCommonToManyViews, ListView):
    model = ModelB

    def get_context_data(self, request, **kwargs):
        context = super(ViewB, self).get_context_data(request, **kwargs)
        context.update({'specific_to_B': 'some_value'})
        return context

edited Oct 1, 2012 at 21:19

answered Oct 1, 2012 at 17:29

dokkaebi

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4 Comments

mr_c Over a year ago

It does look cleaner. Is there a way to do context['specific_to_view'] = 'ViewB here'?

mr_c Over a year ago

sorry should have made that requirement clearer in the question

Dima Bildin Over a year ago

There is. In ViewB define get_context_data(), call it with super and update with 'specific_to_view' value

dokkaebi Over a year ago

Just as @DimaBildin says. I've updated the answer with an example.

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