Template context processor for delegating other context processors to individual apps.
Useful if all views within an app require common context variables that aren't required by other apps.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | from django.conf import settings
from django.core.urlresolvers import resolve
from django.core.exceptions import ImproperlyConfigured
from django.utils.importlib import import_module
def app_delegate(request):
"""
Leverage the DELEGATED_TEMPLATE_CONTEXT_PROCESSORS setting and url
application namespaces to delegate template context processors to
individual apps.
E.g.
# settings.py
TEMPLATE_CONTEXT_PROCESSORS = (
# ...
'path.to.app_delegate'
)
DELEGATED_TEMPLATE_CONTEXT_PROCESSORS = {
'myapp': (
'myproject.myapp.context_processors.do_something',
)
}
# urls.py
(r'^myapp', include('myproject.myapp.urls', app_name='myapp'))
# The above will execute the "do_something" template context processor for
# views accessed via urls in the "myapp" application namespace.
"""
app_name = resolve(request.path).app_name
try:
processors = settings.DELEGATED_TEMPLATE_CONTEXT_PROCESSORS[app_name]
except KeyError:
# Not delegating any processors to this app
return {}
except AttributeError:
raise ImproperlyConfigured('DELEGATED_TEMPLATE_CONTEXT_PROCESSORS setting required to use app delegation of template context processors')
context = {}
# Adapted from django.template.context.get_standard_processors
for path in processors:
i = path.rfind('.')
module, attr = path[:i], path[i+1:]
try:
mod = import_module(module)
except ImportError as e:
raise ImproperlyConfigured('Error importing request processor module %s: "%s"' % (module, e))
try:
func = getattr(mod, attr)
except AttributeError:
raise ImproperlyConfigured('Module "%s" does not define a "%s" callable request processor' % (module, attr))
context.update(func(request))
return context
|
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