[Answer]-Validation when displaying already existing element

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✅

Errors are shown for the “data” parameter ( or instance if it’s a modelform ), not “initial”. You need to pass the original values as the data parameter if you want to display errors.

And then just use the usual validation methods ( raising ValidationError in clean_* methods , field specific validation, etc. ). I wouldn’t mess up with the error dictionary, it’s an internal API.

👤vincent

[Answer]-{% url %} gives NoReverseMatch error

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If you want to do custom form validation, you can implement the clean_<fieldname>() or clean() method on your form, and raise a ValidationError for each error. See the official documentation for details

👤sk1p