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Dynamic Django settings context processor

Author:
sciyoshi
Posted:
July 10, 2008
Language:
Python
Version:
.96
Score:
2 (after 4 ratings)

Here's a nice way of easily passing only certain settings variables to the template. Because of the way Django looks up context processors, we need a little hack with sys.modules. The blog entry is here. 

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# utils/context_processors.py

import sys

from django.conf import settings as django_settings

class SettingsProcessor(object):
    def __getattr__(self, attr):
        if attr == '__file__':
            # autoreload support in dev server
            return __file__
        else:
            return lambda request: {attr: getattr(django_settings, attr)}

sys.modules[__name__ + '.settings'] = SettingsProcessor()

# in settings.py

TEMPLATE_CONTEXT_PROCESSORS = (
    # ....
    'utils.context_processors.settings.GOOGLEMAPS_KEY',
    'utils.context_processors.settings.TEMPLATE_DEBUG',
    'utils.context_processors.settings.MAXMIND_URL',
)

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Comments

nedbatchelder (on August 17, 2012):

I'm sorry, but this seems crazy. I heard about this snippet because of a bug report that it breaks coverage.py (https://bitbucket.org/ned/coveragepy/issue/192)

Why not write a simple context processor that does what you want, like this:

# utils/context_processor.py

from django.conf import settings

def some_settings(request):
    return dict( # wrapped oddly to stay narrow
        (k, getattr(settings, k)) 
        for k in settings.SETTINGS_IN_CONTEXT
    )

# settings.py
TEMPLATE_CONTEXT_PROCESSORS = (
    # ....
    'utils.context_processors.some_settings',
}

SETTINGS_IN_CONTEXT = ['GOOGLEMAPS_KEY', 'TEMPLATE_DEBUG', 'MAXMIND_URL']

#

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