</div>

Then go to the `/docs` UI, you will see that **FastAPI** is using these **models** to **document** the API, and it will use them to **serialize** and **validate** the data too.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Update the App with Multiple Models

Now let's **refactor** this app a bit to increase **security** and **versatility**.

🔜 👆 💪 ▶️ 👆 📱 ⏮️ Uvicorn &amp; 🚶 <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

👆 🔜 👀 👆 🩺 ✅ "⏲" 📄 👆 *➡ 🛠️* 👈 🎦 ❔ *🔢 🛠️* 🔜 👀 💖:

#         "nomsan",
#         "nosan",
#         "notsan",
#         "noubsan",
#     ],
#     deps = [":copybara_config"],
# )
#
# action_config_test(
#     name = "build_cleaner_spec_test",
#     src = "build_cleaner_spec.textproto",
# )
# copybara:uncomment_end

licenses(["notice"])

exports_files([
    "LICENSE",
    # The leakr files are used by //third_party/cloud_tpu and

So, the interactive docs will have all the information from these dependencies too:

<img src="/img/tutorial/dependencies/image01.png">

## Simple usage

```

////

Es wird jedoch empfohlen, den Typ zu deklarieren, da Ihr Editor so weiß, was als Parameter `commons` übergeben wird, und Ihnen dann bei der Codevervollständigung, Typprüfungen, usw. helfen kann:

<img src="/img/tutorial/dependencies/image02.png">

## Abkürzung

Aber Sie sehen, dass wir hier etwas Codeduplizierung haben, indem wir `CommonQueryParams` zweimal schreiben:

//// tab | Python 3.8+

```Python

#       Darwin, MinGW, and NonStop.
#
#   (3) This script is generated from the Groovy template
#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
#       within the Gradle project.
#
#       You can find Gradle at https://github.com/gradle/gradle/.
#

{!../../docs_src/body_nested_models/tutorial008.py!}
```

## Suporte de editor em todo canto

E você obtém suporte do editor em todos os lugares.

Mesmo para itens dentro de listas:

<img src="/img/tutorial/body-nested-models/image01.png">

Você não conseguiria este tipo de suporte de editor se estivesse trabalhando diretamente com `dict` em vez de modelos Pydantic.

///

### 查看文档

现在，使用 Uvicorn 启动应用，打开 <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs。</a>

就能看到文档的*路径操作*已经包含了**回调**的内容以及*外部 API*：

////

Но объявление типа приветствуется, так как в этом случае ваш редактор будет знать, что будет передано в качестве параметра `commons`, и тогда он сможет помочь вам с автодополнением, проверкой типов и т.д:

<img src="/img/tutorial/dependencies/image02.png">

## Сокращение

Но вы видите, что здесь мы имеем некоторое повторение кода, дважды написав `CommonQueryParams`:

//// tab | Python 3.6+ без Annotated

////

//// tab | Python 3.6+

```Python hl_lines="19"
{!> ../../docs_src/dependencies/tutorial003.py!}
```

////

但是声明类型是被鼓励的，因为那样你的编辑器就会知道将传递什么作为参数 `commons` ，然后它可以帮助你完成代码，类型检查，等等：

<img src="/img/tutorial/dependencies/image02.png">

## 快捷方式

但是您可以看到，我们在这里有一些代码重复了，编写了`CommonQueryParams`两次：

```Python
commons: CommonQueryParams = Depends(CommonQueryParams)
```