{* ../../docs_src/pydantic_v1_in_v2/tutorial003_an_py310.py hl[2:3,6,12,21:22] *}

在上面的範例中，輸入模型是 Pydantic v1，輸出模型（於 `response_model=ItemV2` 定義）是 Pydantic v2。

### Pydantic v1 參數 { #pydantic-v1-parameters }

若你需要在 Pydantic v1 模型上使用 FastAPI 的參數工具（例如 `Body`、`Query`、`Form` 等），在完成遷移到 Pydantic v2 之前，可以從 `fastapi.temp_pydantic_v1_params` 匯入：

{* ../../docs_src/pydantic_v1_in_v2/tutorial004_an_py310.py hl[4,18] *}

          <name>profiles</name>
          <version>1.0.0+</version>
          <description>
            Configuration of build profiles for adjusting the build
            according to environmental parameters.
          </description>
          <association>
            <type>Profile</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
        <field xdoc.separator="blank">

 * exceptions whenever it can.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@NullMarked
public class MinimalCollection<E extends @Nullable Object> extends AbstractCollection<E> {
  // TODO: expose allow nulls parameter?

  public static <E extends @Nullable Object> MinimalCollection<E> of(E... contents) {
    return new MinimalCollection<>(Object.class, true, contents);
  }

  // TODO: use this

  fun javaClassTag() {
    val uuidTag = UUID.randomUUID()
    val request =
      Request
        .Builder()
        .url("https://square.com")
        .tag(UUID::class.java, uuidTag) // Use the Class<*> parameter.
        .build()
    assertThat(request.tag()).isNull()
    assertThat(request.tag(Any::class.java)).isNull()
    assertThat(request.tag(UUID::class.java)).isSameInstanceAs(uuidTag)

            builder.allRecordCountRelation(Relation.EQUAL_TO.toString());
            return builder.build();
        }
    }

    /**
     * Test search request parameters implementation.
     */
    static class TestSearchRequestParams extends SearchRequestParams {
        private final int startPosition;
        private final int pageSize;
        private final int offset;

        resolveReportLocationsOnAdd = true
        taskPathToReports.values.asSequence()
            .flatMap { it }
            .forEach { it.resolve() }
    }

    private val rootBuildDir: File get() = parameters.rootBuildDir.get().asFile

    override fun onFinish(event: FinishEvent) {
        if (event is TaskFinishEvent && taskPathToReports.containsKey(event.descriptor.taskPath)) {

will be particularly painful to naughty developers that import from this package! We changed a lot
to take advantage of sweet Kotlin features.

#### Credentials.basic()

The username and password parameters to `Credentials.basic()` are now non-null strings. In OkHttp
3.x, null would yield a username or password of "null".

#### HttpUrl.queryParameterValues()

    assert state.app_startup is True
    assert state.app_shutdown is True


def test_startup_shutdown_handlers_as_parameters(state: State) -> None:
    """Test that startup/shutdown handlers passed as parameters to FastAPI are called correctly."""

    def app_startup() -> None:
        state.app_startup = True

    def app_shutdown() -> None:
        state.app_shutdown = True

    assertThrows(IllegalArgumentException.class, () -> Bytes.ensureCapacity(ARRAY1, 1, -1));
  }

  public void testToArray() {
    // need explicit type parameter to avoid javac warning!?
    List<Byte> none = Arrays.<Byte>asList();
    assertThat(Bytes.toArray(none)).isEqualTo(EMPTY);

    List<Byte> one = Arrays.asList((byte) 1);

            // Act/Assert
            assertThrows(NullPointerException.class, () -> req.createResponse(null, req));
        }

        @Test
        @DisplayName("createResponse tolerates null request parameter")
        void createResponse_nullRequest_ok() {
            // Arrange
            when(cifsContext.getConfig()).thenReturn(configuration);
            Smb2LogoffRequest req = newRequest();

            // Act