if field.DBName == "" && field.DataType != "" {
			field.DBName = namer.ColumnName(schema.Table, field.Name)
		}

		bindName := field.BindName()
		if field.DBName != "" {
			// nonexistence or shortest path or first appear prioritized if has permission
			if v, ok := schema.FieldsByDBName[field.DBName]; !ok || ((field.Creatable || field.Updatable || field.Readable) && len(field.BindNames) < len(v.BindNames)) {

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="90-107"
{!> ../../docs_src/security/tutorial004.py!}
```

////

## Update the `/token` *path operation*

Create a `timedelta` with the expiration time of the token.

Create a real JWT access token and return it.

//// tab | Python 3.10+

```Python hl_lines="118-133"

```

////

/// tip

We'll discuss the `@lru_cache` in a bit.

For now you can assume `get_settings()` is a normal function.

///

And then we can require it from the *path operation function* as a dependency and use it anywhere we need it.

//// tab | Python 3.9+

```Python hl_lines="17  19-21"
{!> ../../docs_src/settings/app02_an_py39/main.py!}
```

////

	}

	// Help for Identity Plugin
	Help = config.HelpKVS{
		config.HelpKV{
			Key:         URL,
			Description: `plugin hook endpoint (HTTP(S)) e.g. "http://localhost:8181/path/to/endpoint"` + defaultHelpPostfix(URL),
			Type:        "url",
		},
		config.HelpKV{
			Key:         AuthToken,
			Description: "authorization token for plugin hook endpoint" + defaultHelpPostfix(AuthToken),

* <abbr title="also known as: serialization, parsing, marshalling">Conversion</abbr> of input data: coming from the network to Python data and types. Reading from:
    * JSON.
    * Path parameters.
    * Query parameters.
    * Cookies.
    * Headers.
    * Forms.
    * Files.

    /** The key of the configuration. e.g. java */
    String JAVA_COMMAND_PATH = "java.command.path";

    /** The key of the configuration. e.g. python */
    String PYTHON_COMMAND_PATH = "python.command.path";

    /** The key of the configuration. e.g. UTF-8 */
    String PATH_ENCODING = "path.encoding";

    /** The key of the configuration. e.g. true */
    String USE_OWN_TMP_DIR = "use.own.tmp.dir";

    checkNotNull(seq);
    if (index < end) {
      char c1 = seq.charAt(index++);
      if (c1 < Character.MIN_HIGH_SURROGATE || c1 > Character.MAX_LOW_SURROGATE) {
        // Fast path (first test is probably all we need to do)
        return c1;
      } else if (c1 <= Character.MAX_HIGH_SURROGATE) {
        // If the high surrogate was the last character, return its inverse
        if (index == end) {

E pronto.

**2 linhas**.

E com a mesma forma e estrutura de todas as suas *funções de operação de rota*.

Você pode pensar nela como uma *função de operação de rota* sem o "decorador" (sem a linha `@app.get("/some-path")`).

E com qualquer retorno que você desejar.

Neste caso, a dependência espera por:

* Um parâmetro de consulta opcional `q` do tipo `str`.

			return
		}

		errResp := objectAttributesErrorResponse{
			ArgumentName:  &argumentName,
			ArgumentValue: &argumentValue,
			APIErrorResponse: getAPIErrorResponse(
				ctx,
				apiErr,
				r.URL.Path,
				w.Header().Get(xhttp.AmzRequestID),
				w.Header().Get(xhttp.AmzRequestHostID),
			),
		}

		writeResponse(w, apiErr.HTTPStatusCode, encodeResponse(errResp), mimeXML)
	}()

<img src="/img/tutorial/generate-clients/image04.png">

响应(response)对象也拥有自动补全:

<img src="/img/tutorial/generate-clients/image05.png">

## 带有标签的 FastAPI 应用

在许多情况下，你的FastAPI应用程序会更复杂，你可能会使用标签来分隔不同组的*路径操作(path operations)*。

例如，您可以有一个用 `items` 的部分和另一个用于 `users` 的部分，它们可以用标签来分隔：

//// tab | Python 3.9+

```Python hl_lines="21  26  34"
{!> ../../docs_src/generate_clients/tutorial002_py39.py!}
```

////