* element. There are five new bulk-modification operations, for example {@link #add(Object, int)},
 * to add or remove multiple occurrences of an element at once, or to set the count of an element to
 * a specific value. These modification operations are optional, but implementations which support
 * the standard collection operations {@link #add(Object)} or {@link #remove(Object)} are encouraged

# Corpo - Campos

Da mesma forma que você pode declarar validações adicionais e metadados nos parâmetros de *funções de operações de rota* com `Query`, `Path` e `Body`, você pode declarar validações e metadados dentro de modelos do Pydantic usando `Field` do Pydantic.

## Importe `Field`

Primeiro, você tem que importá-lo:

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

/// warning | Aviso

    @Resource
    protected FessConfig fessConfig;

    /**
     * Creates a new instance of DuplicateHostService.
     * This constructor initializes the service for managing duplicate host configuration operations
     * including CRUD operations and search functionality.
     */
    public DuplicateHostService() {
        super();
    }

    /**
     * Retrieves a paginated list of duplicate host configurations based on search criteria.

 */
package org.codelibs.fess.auth.chain;

import org.codelibs.fess.opensearch.user.exentity.User;

/**
 * Interface for authentication chain operations.
 * Provides methods for user management and authentication operations.
 */
public interface AuthenticationChain {

    /**
     * Updates an existing user in the authentication chain.
     * @param user The user to update.
     */

### Aplicação de nível superior

Primeiro, crie a aplicação principal, de nível superior, **FastAPI**, e suas *operações de rota*:

{* ../../docs_src/sub_applications/tutorial001.py hl[3,6:8] *}

### Sub-aplicação

Em seguida, crie sua sub-aplicação e suas *operações de rota*.

     */
    @Resource
    protected FessConfig fessConfig;

    /**
     * Creates a new instance of DataConfigService.
     * This constructor initializes the service for managing data configuration operations
     * including CRUD operations and search functionality.
     */
    public DataConfigService() {
        super();
    }

    /**
     * Retrieves a paginated list of data configurations based on search criteria.
     *

    public void test_multiple_quick_operations() {
        try {
            // Multiple quick operations to verify overall performance
            dataIndexHelper.setCrawlingExecutionInterval(1L);
            for (int i = 0; i < 3; i++) {
                dataIndexHelper.crawl("test-session-" + i);
            }
            assertTrue("Multiple operations should complete quickly", true);
        } catch (Exception e) {

import org.codelibs.fess.app.web.admin.dict.kuromoji.EditForm;

/**
 * Request body class for Kuromoji dictionary edit operations in the admin REST API.
 * This class extends EditForm to inherit the necessary form validation and binding capabilities
 * for Kuromoji dictionary management operations.
 */
public class EditBody extends EditForm {

    /**
     * Default constructor.
     */
    public EditBody() {

import org.codelibs.fess.app.web.admin.dict.stopwords.EditForm;

/**
 * Request body class for stop words dictionary edit operations in the admin REST API.
 * This class extends EditForm to inherit the necessary form validation and binding capabilities
 * for stop words dictionary management operations.
 */
public class EditBody extends EditForm {

    /**
     * Default constructor.
     */
    public EditBody() {

import jcifs.dcerpc.DcerpcHandle;
import jcifs.dcerpc.rpc;
import jcifs.smb.SmbException;

/**
 * Handle for Security Account Manager (SAM) policy operations.
 * This class represents an open handle to a SAM server and provides
 * high-level access to SAM database operations.
 */
public class SamrPolicyHandle extends rpc.policy_handle implements AutoCloseable {

    private final DcerpcHandle handle;
    private boolean opened;