def form_post(self, form):
        """
        Override this method to implement your form processing

        :param form: WTForm form

        Return None or a flask response to render
        a custom template or redirect the user
        """

        Override this method to implement your form processing

        :param form: WTForm form

        Return None or a flask response to render
        a custom template or redirect the user
        
flask_appbuilder/baseviews.py