def _merge_update_item(self, model_item, data):
data_item = self.edit_model_schema.dump(model_item, many=False).data<EOL>for _col in self.edit_columns:<EOL><INDENT>if _col not in data.keys():<EOL><INDENT>data[_col] = data_item[_col]<EOL><DEDENT><DEDENT>return data<EOL>
Merge a model with a python data structure
    This is useful to turn PUT method into a PATCH also
:param model_item: SQLA Model
:param data: python data structure
:return: python data structure