CODEWITHSUNDEEP
djangodjango-templates
StephenTG
StephenTG

Reputation: 2657

Default boolean to something that isn't falsey in Django template

I'm working in a Django template and I want to check the value of a boolean and print 'bold' if it's True, and 'plain' if it's False. If the value is blank or not defined, I want to treat it as if it is True. Here's what I'm currently using:

{{ something.boolean_val|yesno:"bold,plain,bold" }}

However, when something.boolean isn't defined, it's treating it as False, not None. I tried adding a |default_if_none filter, but that did nothing. When I tried |default, it changed False values as well.

Delving deeper into the docs, it seems that an undefined variable is set to '' by default, which gets treated as False. I only want to treat an undefined variable as True (None would also be fine) in this particular situation, so I don't want to fiddle with TEMPLATE_STRING_IF_INVALID.

Is there a way to make this treat an undefined variable as True? Alternatively, is there a way I could distinguish '' from False?

Upvotes: 0

Views: 677

Answers (1)

Renoc
Renoc

Reputation: 439

I don't see it as a filter but in the template language logic you can use '==' which equates to '===' or 'is' in python and does not match None or '' to False the way that using 'not' does.

{% if something.boolean_val == False %}plain{% else %}bold{% endif %}

Upvotes: 1

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