code: def form_out(self, _form=None):
          
          _form = _form or self.object_form
          self.output['forms'] = _form.serialize()
          self._add_meta_props(_form)
          self.output['forms']['grouping'] = _form.Meta.grouping
          self.output['forms']['constraints'] = _form.Meta.constraints
          self._patch_form(self.output['forms'])
          self.set_client_cmd('form')
docs: Renders form. Applies form modifiers, then writes
          result to response payload. If supplied, given form
          object instance will be used instead of view's
          default ObjectForm.
  
          Args:
               _form (:py:attr:`~zengine.forms.json_form.JsonForm`):
                Form object to override `self.object_form`