Determine why WTForms form didn't validate

Question

I called form.validate_on_submit() , but it returned False . How can I find out why the form didn't validate?

Answer 1

For the whole form, form.errors contains a map of fields to lists of errors. If it is not empty, then the form did not validate. For an individual field, field.errors contains a list of errors for that field. The list is the same as the one in form.errors .

form.validate() performs validation and populates errors . When using Flask-WTF, form.validate_on_submit() performs an additional check that request.method is a "submit" method, which mostly means it is not a GET request.