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This article mainly explains "how to solve the ChoiceField and MultipleChoiceField error tips of Django". The explanation in the article is simple and clear and easy to learn and understand. Please follow the editor's train of thought to study and learn "how to solve the ChoiceField and MultipleChoiceField error tips of Django".

Error in form validation: select a valid option

For example, there is a form like this:

Class ProductForm (Form): category = fields.MultipleChoiceField (widget=widgets.SelectMultiple (), choices= ((1, 'unclassified'),)

Now there is only one option for category in this form, value is 1, which is displayed as unclassified, and if the value submitted in the page is not 1, it will prompt "error selecting a valid option".

In general, we get data from the database when request.method equals GET in the view function, and assign a value to choices. So note here that we also assign a value to choices before calling the check function (is_valid ()) when request.method equals POST. Otherwise, the error will be checked due to the lack of the corresponding option in the option.

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