For example, as in the `Image` model we have a `url` field, we can declare it to be an instance of Pydantic's `HttpUrl` instead of a `str`:

{* ../../docs_src/body_nested_models/tutorial005_py310.py hl[2,8] *}

The string will be checked to be a valid URL, and documented in JSON Schema / OpenAPI as such.

## Attributes with lists of submodels { #attributes-with-lists-of-submodels }

   * Returns the name of this service. {@link AbstractScheduledService} may include the name in
   * debugging output.
   *
   * @since 14.0
   */
  protected String serviceName() {
    return getClass().getSimpleName();
  }

  @Override
  public String toString() {
    return serviceName() + " [" + state() + "]";
  }

  @Override
  public final boolean isRunning() {
    return delegate.isRunning();
  }

      fail("Cast to short should have failed: " + value);
    } catch (IllegalArgumentException ex) {
      assertWithMessage(value + " not found in exception text: " + ex.getMessage())
          .that(ex.getMessage().contains(String.valueOf(value)))
          .isTrue();
    }
  }

  // We need to test that our method behaves like the JDK method.
  @SuppressWarnings("InlineMeInliner")
  public void testCompare() {

  }

  private fun executeSynchronously(request: Request): RecordedResponse {
    val call = client.newCall(request)
    return try {
      val response = call.execute()
      val bodyString = response.body.string()
      RecordedResponse(request, response, null, bodyString, null)
    } catch (e: IOException) {
      RecordedResponse(request, null, null, null, e)
    }
  }

        SmbTree tree = new SmbTree(session, "testShare", "testService");
        tree.tid = 123;
        tree.inDfs = true;
        tree.inDomainDfs = false;
        tree.connectionState = 2;

        String result = tree.toString();
        // Verify the toString contains the expected information
        assertTrue(result.contains("TESTSHARE"));
        assertTrue(result.contains("testService"));

        assertTrue(result > 0);
        assertNotNull(response.getSecurityDescriptor());
    }

    @Test
    @DisplayName("Test toString returns expected format")
    void testToString() {
        String result = response.toString();

        assertNotNull(result);
        assertTrue(result.startsWith("NtTransQuerySecurityResponse["));
        assertTrue(result.endsWith("]"));
    }

    @Test

Por exemplo, no modelo `Image` nós temos um campo `url`, nós podemos declara-lo como um `HttpUrl` do Pydantic invés de como uma `str`:

{* ../../docs_src/body_nested_models/tutorial005.py hl[4,10] *}

A string será verificada para se tornar uma URL válida e documentada no esquema JSON/1OpenAPI como tal.

## Atributos como listas de submodelos

Você também pode usar modelos Pydantic como subtipos de `list`, `set`, etc:

    private static final int SIGNATURE_LENGTH = 16;
    private final Mac digest;
    private final ReentrantLock signingLock = new ReentrantLock();
    private byte[] signingKey;
    private final String algorithmName;
    private final java.security.Provider provider;
    private volatile boolean closed = false;

    /**
     * Constructs a SMB2 signing digest with the specified session key and dialect
     *

			staleDisks[j] = badDisk{nil}
		}

		staleWriters := make([]io.Writer, len(staleDisks))
		for i, disk := range staleDisks {
			if disk == nil {
				continue
			}
			os.Remove(pathJoin(disk.String(), "testbucket", "testobject"))
			staleWriters[i] = newBitrotWriter(disk, "", "testbucket", "testobject", erasure.ShardFileSize(test.size), test.algorithm, erasure.ShardSize())
		}

public class ChannelManager {

    private static final Logger log = LoggerFactory.getLogger(ChannelManager.class);

    private final CIFSContext context;
    private final SmbSession session;
    private final Map<String, ChannelInfo> channels;
    private final List<NetworkInterfaceInfo> localInterfaces;
    private final List<NetworkInterfaceInfo> remoteInterfaces;
    private final ScheduledExecutorService scheduler;