Allow context processors access to current version of context

[Mitar]

Allow context processors access to current version of context so that they can change values and not just override them. This can be easily done with another argument, context, and also backwards compatible. Functions would only get additional argument if they are defined to get two arguments and whatever they would return would override that in the context.

[Mitar]

I could make a patch if there would be an agreement that this is useful.

[vbmendes]

I think this is a very useful feature. It also allows to develop context processor that add a context variable based in another context variable.

[Gregor Müllegger]

mitar:

I could make a patch if there would be an agreement that this is useful.

It seems that you want to discuss this first before implementing. The best place for discussion is the django-developers mailinglist[1] - writing your proposal there will result in better feedback and you can get an idea if core developers also find this useful and would accept a patch.

[1] ​http://groups.google.com/group/django-developers

[Mitar]

There was completely no response on the mailing list.

[Russell Keith-Magee]

This seems like a reasonable feature request; however, the implementation will need to be very careful about backwards compatibility.

[Simon Litchfield]

Mitar, this sounds good. Any thoughts on syntax? Maybe something like --

def mycontextprocesser(request, context=None):
    ...

[Simon Litchfield]

Patch attached. Backwards compatible, shouldn't add overhead either (getargspec is only called once for each processor) --

def mycontextprocessor(request):
    ...

def mycontextprocessor(request, context):
    print context.get('request')

[Simon Litchfield]

Updated docs.

[Russell Keith-Magee]

@simon29 - Please don't assign bugs to me without speaking to me first.

[Julien Phalip]

The patch needs tests. Could you also combine everything (new feature, tests and doc) within one single diff patch?

[Colin Copeland]

Combined diff with tests and docs

[Colin Copeland]

I wrote tests and uploaded a combined diff with simon29's changes and docs.

[Jacob]

Milestone 1.4 deleted