But recent versions of Pydantic allow providing a custom class that inherits from `pydantic.utils.GetterDict`, to provide the functionality used when using the `orm_mode = True` to retrieve the values for ORM model attributes.

We are going to create a custom `PeeweeGetterDict` class and use it in all the same Pydantic *models* / schemas that use `orm_mode`:

```Python hl_lines="3  8-13  31  49"

    {!> ../../../docs_src/body_updates/tutorial002.py!}
    ```

### Partial updates recap

In summary, to apply partial updates you would:

* (Optionally) use `PATCH` instead of `PUT`.
* Retrieve the stored data.
* Put that data in a Pydantic model.
* Generate a `dict` without default values from the input model (using `exclude_unset`).

!!! tip
    Also notice that there are `response_models` that have standard Python types like `List[schemas.Item]`.

    But as the content/parameter of that `List` is a Pydantic *model* with `orm_mode`, the data will be retrieved and returned to the client as normally, without problems.

### About `def` vs `async def`