## Add extra information

You can declare extra information in `Field`, `Query`, `Body`, etc. And it will be included in the generated JSON Schema.

You will learn more about adding extra information later in the docs, when learning to declare examples.

!!! warning

    new_field.populate_validators()  # type: ignore[attr-defined]
    return new_field


def generate_operation_id_for_path(
    *, name: str, path: str, method: str
) -> str:  # pragma: nocover
    warnings.warn(
        "fastapi.utils.generate_operation_id_for_path() was deprecated, "
        "it is not used internally, and will be removed soon",
        DeprecationWarning,

    * If you didn't use FastAPI and used Starlette directly (or another tool, like Sanic, Flask, Responder, etc) you would have to implement all the data validation and serialization yourself. So, your final application would still...

You can also combine `dataclasses` with other type annotations to make nested data structures.

In some cases, you might still have to use Pydantic's version of `dataclasses`. For example, if you have errors with the automatically generated API documentation.

In that case, you can simply swap the standard `dataclasses` with `pydantic.dataclasses`, which is a drop-in replacement:

```{ .python .annotate hl_lines="1  5  8-11  14-17  23-25  28" }

### Déployer une application FastAPI

La façon la plus simple de tout mettre en place, serait d'utiliser les [**Générateurs de projet FastAPI**](../project-generation.md){.internal-link target=_blank}.

Le génerateur de projet adéquat est conçu pour être intégré à ce cluster Docker Swarm avec Traefik et HTTPS décrit ci-dessus.

Vous pouvez générer un projet en 2 min environ.

而且您还可以将 Alembic 用于“迁移”（这是它的主要工作）。

“迁移”是每当您更改 SQLAlchemy 模型的结构、添加新属性等以在数据库中复制这些更改、添加新列、新表等时所需的一组步骤。

您可以在[Project Generation - Template](https://fastapi.tiangolo.com/zh/project-generation/)的模板中找到一个 FastAPI 项目中的 Alembic 示例。具体在[`alembic`代码目录中](https://github.com/tiangolo/full-stack-fastapi-postgresql/tree/master/src/backend/app/alembic/)。

### 创建依赖项

* <a href="https://github.com/tiangolo/full-stack-flask-couchdb" class="external-link" target="_blank">https://github.com/tiangolo/full-stack-flask-couchdb</a>

&amp; 👫 🎏 🌕-📚 🚂 🧢 [**FastAPI** 🏗 🚂](project-generation.md){.internal-link target=_blank}.

!!! info
    🏺-Apispec ✍ 🎏 🍭 👩‍💻.

!!! check "😮 **FastAPI** "
    🏗 🗄 🔗 🔁, ⚪️➡️ 🎏 📟 👈 🔬 🛠️ &amp; 🔬.

    model_name_map = get_compat_model_name_map(all_fields)
    schema_generator = GenerateJsonSchema(ref_template=REF_TEMPLATE)
    field_mapping, definitions = get_definitions(
        fields=all_fields,
        schema_generator=schema_generator,
        model_name_map=model_name_map,
        separate_input_output_schemas=separate_input_output_schemas,
    )

    <div class="md-copyright__highlight">
        The FastAPI trademark is owned by <a href="https://tiangolo.com" target="_blank">@tiangolo</a> and is registered in the US and across other regions
    </div>
    {% if not config.extra.generator == false %}
    Made with
    <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener">
        Material for MkDocs
    </a>
    {% endif %}

    ```
    pip install async-exit-stack async-generator
    ```

    これにより<a href="https://github.com/sorcio/async_exit_stack" class="external-link" target="_blank">async-exit-stack</a>と<a href="https://github.com/python-trio/async_generator" class="external-link" target="_blank">async-generator</a>がインストールされます。

!!! note "技術詳細"
    以下と一緒に使用できる関数なら何でも有効です: