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Editorial Team
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Asked: 2026-05-13T12:53:19+00:00

As a long time PHP developer, I’m used to the idea of setting the

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As a long time PHP developer, I’m used to the idea of setting the error level for my application to warn me when I am using an uninitialized variable. I was wondering if a similar feature exists in Django, where I can detect at run-time that I am using a variable in my template that was not explicitly passed to the template via the view?

For example, I misspelled a variable name in the template

{{ mysearch }}

When it should’ve been 

{{ my_search }}

Common mistake, not paying attention while typing, etc. In PHP I would’ve seen a warning about using an uninitiailzed variable but Django doesn’t seem to care and just keeps on going like nothing happened. From a debugging perspective, it would be awesome to detect when I’ve made a mistake like that.

Any thoughts?

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1 Answer

  1. Editorial Team

    Are you looking for this? http://docs.djangoproject.com/en/1.1/ref/templates/api/#invalid-template-variables

    Have you tried setting TEMPLATE_STRING_IF_INVALID? e.g.,

    TEMPLATE_STRING_IF_INVALID = 'DEBUG WARNING: template variable [%s] is not defined'

    That will cause that string to be printed in the rendered html for each spot where an undefined variable was referenced, along with the variable name.

    Read this: http://docs.djangoproject.com/en/1.1/ref/settings/#setting-TEMPLATE_STRING_IF_INVALID

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