def get_form_helper(self):
        helper = super(RevisionView, self).get_form_helper()
        diff_fields = {}
        version_data = self.version.field_dict
        for f in self.opts.fields:
            if f.value_from_object(self.org_obj) not in version_data.get(f.name, None):
                diff_fields[f.name] = self.detail.get_field_result(f.name).val
        for k, v in diff_fields.items():
            helper[k].wrap(DiffField, orgdata=v)
        return helper
dataset/ETHPy150Open sshwsfc/xadmin/xadmin/plugins/xversion.py/RevisionView.get_form_helper/operator `!=` -> `not in`