///

## Без Pydantic { #without-pydantic }

///

## Без Pydantic

# Body - Вложенные модели { #body-nested-models }

С помощью **FastAPI** вы можете определять, валидировать, документировать и использовать модели произвольной глубины вложенности (благодаря Pydantic).

## Поля-списки { #list-fields }

Вы можете определить атрибут как подтип. Например, Python-тип `list`:

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

{* ../../docs_src/body_nested_models/tutorial008_py39.py hl[13] *}

## Підтримка в редакторі всюди

Ви отримаєте підтримку в редакторі всюди.

Навіть для елементів у списках:

<img src="/img/tutorial/body-nested-models/image01.png">

Ви не змогли б отримати таку підтримку в редакторі, якби працювали напряму зі  `dict`, а не з моделями Pydantic.

        response.trailers()
      }
    }
  }

  private fun MockResponse.Builder.body(
    protocol: Protocol,
    body: String,
  ) = apply {
    when (protocol) {
      Protocol.HTTP_1_1 -> chunkedBody(body, 1024) // Force multiple chunks.
      else -> body(body)
    }
  }

  private fun enableProtocol(protocol: Protocol) {
    if (protocol == Protocol.HTTP_2) {

  /**
   * Closes the response body. Equivalent to `body().close()`.
   *
   * Prior to OkHttp 5.0, it was an error to close a response that is not eligible for a body. This
   * includes the responses returned from [cacheResponse], [networkResponse], and [priorResponse].
   */
  override fun close() {
    body.close()
  }

          cursor
          node {
            id
            url
            body
          }
        }
      }
    }
  }
}
"""

add_comment_mutation = """
mutation Q($discussion_id: ID!, $body: String!) {
  addDiscussionComment(input: {discussionId: $discussion_id, body: $body}) {
    comment {
      id
      url
      body
    }
  }
}
"""

update_comment_mutation = """

  ): Sink =
    when {
      request.body?.isDuplex() == true -> throw ProtocolException(
        "Duplex connections are not supported for HTTP/1",
      )
      request.isChunked -> newChunkedSink() // Stream a request body of unknown length.
      contentLength != -1L -> newKnownLengthSink() // Stream a request body of a known length.
      else -> // Stream a request body of a known length.
        throw IllegalStateException(

    val response2 = client.newCall(request).execute()
    response1.body.string() // Discard the response body.
    response2.body.string() // Discard the response body.
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(0)
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(1)
  }

  @Test
  fun connectionsAreEvicted() {
    server.enqueue(MockResponse(body = "a"))
    server.enqueue(MockResponse(body = "b"))

) -> None:
    status_code, body = _bench_get(benchmark, client, "/sync/model-no-response-model")
    assert status_code == 200
    assert body == b'{"name":"foo","value":123,"dep":42}'


def test_sync_return_model_with_response_model(benchmark, client: TestClient) -> None:
    status_code, body = _bench_get(benchmark, client, "/sync/model-with-response-model")
    assert status_code == 200