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I have a Django application that provides template tag profile. The tag accepts a username as its argument. How should I treat the situation when there exists no User instance with the given username? Does it make sense to raise HTTP 404 inside a template tag? Or should I simply pass an empty dictionary to the template?
I don’t think it’s possible to raise a 404 from the template, and you shouldn’t do it if you could. You should keep the logic and presentation separate.
You have two sound possibilities.
You don’t say exactly what your template tag is doing, so I can’t recommend any of the two, but the most normal thing to do with a template tag, is to fail silently.