Pero ese tipo puede ser en sí mismo otro modelo Pydantic.

Así que, puedes declarar "objetos" JSON anidados profundamente con nombres de atributos específicos, tipos y validaciones.

Todo eso, de manera arbitraria.

### Definir un submodelo

Por ejemplo, podemos definir un modelo `Image`:

{* ../../docs_src/body_nested_models/tutorial004_py310.py hl[7:9] *}

### Usar el submodelo como tipo

     * if:
     *
     * {@snippet :
     * Objects.equals(a.getElement(), b.getElement())
     *     && a.getCount() == b.getCount()
     * }
     */
    @Override
    // TODO(kevinb): check this wrt TreeMultiset?
    boolean equals(@Nullable Object o);

    /**
     * {@inheritDoc}
     *
     * <p>The hash code of a multiset entry for element {@code element} and count {@code count} is

        // TODO always returns empty list
        return split(getIndexAdminArrayFields(), ",").get(stream -> stream.filter(StringUtil::isNotBlank)
                .map(String::trim)
                .filter(s -> isNonEmptyValue(source.get(s)))
                .filter(s -> false) // TODO
                .collect(Collectors.toList()));
    }

        // Assert
        assertNotNull(trace, "Instance should be created");
    }

    @Test
    @DisplayName("Constructor with delegate: acquire() forwards to delegate and release() too")
    void constructor_withDelegate_acquireAndReleaseForwarded() {
        // Arrange: delegate we can spy on for interaction verification
        CIFSContext ctx = mock(CIFSContext.class);

        // Arrange
        TransTransactNamedPipe trans = new TransTransactNamedPipe(mockConfig, TEST_FID, TEST_DATA, TEST_OFFSET, TEST_LENGTH);
        byte[] dst = new byte[5]; // Buffer too small
        int dstIndex = 0;

        // Act
        int bytesWritten = trans.writeDataWireFormat(dst, dstIndex);

        // Assert
        assertEquals(0, bytesWritten);
    }

    @Test

        if (sourceCount == 0) {
          fileToClose = file
          file = null
        }
      }

      fileToClose?.closeQuietly()
    }
  }

  companion object {
    // TODO(jwilson): what to do about timeouts? They could be different and unfortunately when any
    //     timeout is hit we like to tear down the whole stream.

    private const val SOURCE_UPSTREAM = 1

    assertThat(e).hasMessageThat().contains("toString representation");
  }

  private static void assertErrorMessage(Throwable e, String message) {
    // TODO(kevinb): use a Truth assertion here
    if (!e.getMessage().contains(message)) {
      fail("expected <" + e.getMessage() + "> to contain <" + message + ">");
    }
  }

  /**

    ImmutableSortedSet<String> sortedSet = ImmutableSortedSet.of("a");
    ImmutableSet<String> copy = ImmutableSet.copyOf(sortedSet);
    assertNotSame(sortedSet, copy);
  }

  // TODO(b/172823566): Use mainline testToImmutableSet once CollectorTester is usable to java7.
  public void testToImmutableSet_java7() {
    ImmutableSet.Builder<String> zis = ImmutableSet.<String>builder().add("a", "b", "a");

    TimedWaiterThread waiter = new TimedWaiterThread(future, Long.MAX_VALUE, SECONDS);
    waiter.start();
    waiter.awaitWaiting();

    future.set(1);
    waiter.join();
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testSetNull() throws Exception {
    future.set(null);
    assertSuccessful(future, null);
  }

  public void testSetExceptionNull() throws Exception {

    checkNotNull(list);
    checkNotNull(presentBehavior);
    checkNotNull(absentBehavior);
    if (!(list instanceof RandomAccess)) {
      list = new ArrayList<>(list);
    }
    // TODO(lowasser): benchmark when it's best to do a linear search

    int lower = 0;
    int upper = list.size() - 1;

    while (lower <= upper) {
      int middle = (lower + upper) >>> 1;