Y podemos agregar una lista de `dependencies` que se añadirá a todas las *path operations* en el router y se ejecutarán/solucionarán por cada request que les haga.

/// tip | Consejo

import jakarta.validation.constraints.Size;

/**
 * Form class for editing path mapping configurations in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing path map entries,
 * including tracking information for optimistic locking and audit trails.
 * Path mappings are used to transform document URLs and paths during indexing and display.
 *
 */

# ボディ - フィールド

`Query`や`Path`、`Body`を使って *path operation関数* のパラメータに追加のバリデーションやメタデータを宣言するのと同じように、Pydanticの`Field`を使ってPydanticモデルの内部でバリデーションやメタデータを宣言することができます。

## `Field`のインポート

まず、以下のようにインポートします:

{* ../../docs_src/body_fields/tutorial001.py hl[4] *}

/// warning | 注意

`Field`は他の全てのもの（`Query`、`Path`、`Body`など）とは違い、`fastapi`からではなく、`pydantic`から直接インポートされていることに注意してください。

///

## モデルの属性の宣言

以下のように`Field`をモデルの属性として使用することができます:

<!DOCTYPE components PUBLIC "-//DBFLUTE//DTD LastaDi 1.0//EN"
	"http://dbflute.org/meta/lastadi10.dtd">
<components namespace="fessCrawler">
	<include path="crawler/container.xml" />
	<include path="crawler/robotstxt.xml" />
	<include path="crawler/contentlength.xml" />
	<include path="crawler/mimetype.xml" />

	<component name="internalHttpClient" class="org.codelibs.fess.crawler.client.http.HcHttpClient"
		instance="prototype">

        final String host = u.getHost();
        String path, ref;
        int port;

        if (spec.equals("smb://")) {
            spec = "smb:////";
            limit += 2;
        } else if (!spec.startsWith("smb://") && host != null && host.length() == 0) {
            spec = "//" + spec;
            limit += 2;
        }
        super.parseURL(u, spec, start, limit);
        path = u.getPath();
        ref = u.getRef();

  struct TF_StringStream* s = TF_GetLocalTempDirectories();
  const char* path;

  if (!TF_StringStreamNext(s, &path)) {
    fprintf(stderr, "TF_GetLocalTempDirectories returned no results\n");
    return 1;
  }

  char file_name[100];
  time_t t = time(NULL);
  snprintf(file_name, sizeof(file_name), "test-%d-%ld.txt", getpid(), t);

  size_t length = 2 + strlen(path) + strlen(file_name);
  char* full_path = malloc(length);

		{
			path:   "/bucket/object///////",
			bucket: "bucket",
			object: "object///////",
		},
		// Test case 7 object has preceding separators.
		{
			path:   "/bucket////object////",
			bucket: "bucket",
			object: "///object////",
		},
		// Test case 8 url path is empty.
		{
			path:   "",
			bucket: "",
			object: "",
		},
	}

	// Validate all test cases.

        super.setUp();

        Path tempDir = Files.createTempDirectory("smb1data");
        Path publicDir = tempDir.resolve("public");
        Files.createDirectory(publicDir);
        Path usersDir = tempDir.resolve("users");
        Files.createDirectory(usersDir);
        Path testuser1Dir = tempDir.resolve("testuser1");
        Files.createDirectory(testuser1Dir);
        Path testuser2Dir = tempDir.resolve("testuser2");

        Path path = rootBuildDirectory.resolve(RESUME_PROPERTIES_FILENAME);
        if (!Files.exists(path)) {
            LOGGER.warn("The {} file does not exist. The --resume / -r feature will not work.", path);
            return properties;
        }

        try (Reader reader = Files.newBufferedReader(path)) {
            properties.load(reader);
        } catch (IOException e) {

{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[1,23] *}

### Crea la *path operation* del callback { #create-the-callback-path-operation }

Para crear la *path operation* del callback usa el mismo `APIRouter` que creaste arriba.

Debería verse como una *path operation* normal de FastAPI: