Crash when rendering inclusion_tag with takes_context with multiple context processors

[EmilStenstrom]

I have an inclusion tag that looks something like this:

@register.inclusion_tag("template.html", takes_context=True)
def tag(context, variable):
    context.update({'variable': variable})
    return context

When rendering it I get the following stacktrace deep into floppyforms:
ValueError: dictionary update sequence element #0 has length 6; 2 is required
...because the context that gets sent in via takes_context is a list of dictionaries, not a dictionary. I think it's because that each context_processor adds one dictionary and that Django transparently handles that normally.

Here's the full stacktrace: http://dpaste.com/2FWD49D

It does not happen in floppyforms 1.3.0, but happens in 1.4.1. I think it might have something to do with this commit: d591b12

A workaround is to apply flatten_contexts to the inclusion tag:

@register.inclusion_tag("template.html", takes_context=True)
def tag(context, variable):
    from floppyforms.compat import flatten_contexts
    context = flatten_contexts(context)
    context.update({'variable': variable})
    return context

Sorry that I don't have time to write a proper testcase right now.

[gregmuellegger]

Hi, thanks for the report. I added some tests in the branch issue/153 (9baf923) but the tests seem to pass for this.

Do you do anything differently than I do in the tests?

[EmilStenstrom]

I'll have a look at the tests tomorrow and see if I can make them fail by adding more of my use case in there. I have an {% include "template.html" %} there and I think that context_processors might affect the how the context is returned. But I need to experiment a bit to get to a use case. Thanks for getting me started! :)