i have this template: http://dpaste.com/645468/ that send data to this view: http://dpaste.com/645469/. the template display a form made by modelforms, with a custom layout. i have to validate the fields value send to view, and then redirect to the same template if the field validation fails. i've tried to do it by creating an instance of the related model, then gathering all fields one by one (checking before if they are present in request.POST) and assigning it to the model field, and then assigning that model instance to a new modelform instance. then i've prefromed a .is_valid() check, but it fails since it require the model instance pc, so that model instance need to exist on db. so how can i validate those data, and if validation fails, redirect to another template and display the errors?
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