Django doesn't create a {{ debug }} variable in DEBUG mode

Question

As of the documentation, there should be variables called "debug" and "sql_queries" usable in templates if all requirements are met.

I have set the following (and checked their values with the debug toolbar):

DEBUG = True
TEMPLATE_DEBUG = True
TEMPLATE_CONTEXT_PROCESSORS left at its default value (containing 'django.core.context_processors.debug')
INTERNAL_IPS = ('127.0.0.1',) (and the debug toolbar shows REMOTE_ADDR = '127.0.0.1' under "HTTP Headers")
TEMPLATE_STRING_IF_INVALID = "(invalid variable '%s'!)"

When rendering a template containing {{ sql_queries }} {{ debug }}, I get (invalid variable 'sql_queries'!) (invalid variable 'debug'!) as output.

My Django version is 1.2.3. What am I missing here?

Ned Batchelder · Accepted Answer · 2010-10-16 13:09:03Z

3

In your view, are you creating a Context, or a RequestContext? It needs to be RequestContext.

answered Oct 16, 2010 at 13:09

Ned Batchelder

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3 Comments

AndiDog Over a year ago

Well, I'm just using render_to_response("some.template.file").

Ned Batchelder Over a year ago

The docs include this text: "If you need to use context processors, render the template with a RequestContext instance instead. Your code might look something like this: render_to_response('my_template.html', my_data_dictionary, context_instance=RequestContext(request)) "

AndiDog Over a year ago

Okay that helped me find the answer, thank you very much! A RequestContext instance must be passed explicitly.

AndiDog · Accepted Answer · 2012-03-27 16:32:47Z

1

Ned Batchelder's answer led me to the right direction. A RequestContext instance must be explicitly passed when using render_to_response:

return render_to_response("some.template.file",
                          templateArguments,
                          context_instance = RequestContext(request))

From Django 1.3, you can use the render function as shorthand:

return render(request, "some.template.file", templateArguments)

edited Mar 27, 2012 at 16:32

answered Oct 16, 2010 at 13:18

AndiDog

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2 Comments

hobbes3 Over a year ago

return render( request, "some.template.file", templateArguments ) is shorter and by default it uses RequestContext.

AndiDog Over a year ago

@hobbes3: Right, that was introduced in 1.3 - I grew up using the old variant. Edited my answer, thanks!

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