In some special use cases (probably not very common), you might want to **restrict** the query parameters that you want to receive.

You can use Pydantic's model configuration to `forbid` any `extra` fields:

{* ../../docs_src/query_param_models/tutorial002_an_py310.py hl[10] *}

If a client tries to send some **extra** data in the **query parameters**, they will receive an **error** response.

    /**
     * Test the constructor of MsrpcQueryInformationPolicy.
     * It should correctly call the super constructor and set ptype and flags.
     */
    @Test
    @DisplayName("Constructor should initialize fields and call super constructor")
    void constructorTest() {
        short level = 1;

        // Create an instance of the class under test

| `contact` | `dict` | La información de contacto para la API expuesta. Puede contener varios campos. <details><summary><code>contact</code> fields</summary><table><thead><tr><th>Parámetro</th><th>Tipo</th><th>Descripción</th></tr></thead><tbody><tr><td><code>name</code></td><td><code>str</code></td><td>El nombre identificativo de la persona/organización de contacto.</td></tr><tr><td><code>u...

## List alanları { #list-fields }

Bir attribute’u bir alt tipe sahip olacak şekilde tanımlayabilirsiniz. Örneğin, bir Python `list`:

{* ../../docs_src/body_nested_models/tutorial001_py310.py hl[12] *}

Bu, `tags`’in bir list olmasını sağlar; ancak list’in elemanlarının tipini belirtmez.

## Tip parametresi olan list alanları { #list-fields-with-type-parameter }

        }
        return OptionalEntity.empty();
    }

    /**
     * Gets a duplicate host entity from the form, setting audit fields.
     *
     * @param form the form containing duplicate host data
     * @return optional duplicate host entity with audit fields set
     */
    public static OptionalEntity<DuplicateHost> getDuplicateHost(final CreateForm form) {

# Body - 巢狀模型 { #body-nested-models }

使用 **FastAPI**，你可以定義、驗證、文件化，並使用任意深度的巢狀模型（感謝 Pydantic）。

## 列表欄位 { #list-fields }

你可以將屬性定義為某個子型別。例如，Python 的 `list`：

{* ../../docs_src/body_nested_models/tutorial001_py310.py hl[12] *}

這會讓 `tags` 成為一個列表，儘管尚未宣告列表元素的型別。

## 具有型別參數的列表欄位 { #list-fields-with-type-parameter }

不過，Python 有一種專門的方式來宣告具有內部型別（「型別參數」）的列表：

### 宣告帶有型別參數的 `list` { #declare-a-list-with-a-type-parameter }

        "colorMode": "value",
        "graphMode": "area",
        "justifyMode": "auto",
        "orientation": "auto",
        "reduceOptions": {
          "calcs": [
            "mean"
          ],
          "fields": "",
          "values": false
        },
        "showPercentChange": false,
        "text": {},
        "textMode": "auto",
        "wideLayout": true
      },
      "pluginVersion": "10.4.0",

import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

import jakarta.validation.constraints.Size;

/**
 * Form class for editing user roles in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing role entries,
 * including tracking information for optimistic locking and audit trails.
 * Roles define permissions and access levels for users within the system.
 *
 */

import jakarta.validation.constraints.Size;

/**
 * Form class for editing label types in the admin interface.
 * This form extends CreateForm to include fields necessary for updating existing label type entries,
 * including tracking information for optimistic locking and audit trails.
 * Label types are used to categorize and filter documents in search results.
 *
 */

        response.dataCompactionMode = 1;
        response.dataLength = 1024;
        response.dataOffset = 54;

        String result = response.toString();

        // Verify that toString includes the key fields
        assertNotNull(result);
        assertTrue(result.contains("SmbComReadAndXResponse"));
        assertTrue(result.contains("dataCompactionMode=1"));
        assertTrue(result.contains("dataLength=1024"));