```

### `RequestValidationError` vs `ValidationError`

/// warning | "警告"

如果您觉得现在还用不到以下技术细节，可以先跳过下面的内容。

///

`RequestValidationError` 是 Pydantic 的 <a href="https://docs.pydantic.dev/latest/concepts/models/#error-handling" class="external-link" target="_blank">`ValidationError`</a> 的子类。

**FastAPI** 调用的就是 `RequestValidationError` 类，因此，如果在 `response_model` 中使用 Pydantic 模型，且数据有错误时，在日志中就会看到这个错误。

  revive:
    ignore-generated-header: false
    severity: "warning"
    confidence: 0.0
    rules:
      - name: blank-imports
      - name: context-keys-type
      - name: time-naming
      - name: var-declaration
      - name: unexported-return
      - name: errorf
      - name: context-as-argument
      - name: dot-imports
      - name: error-return
      - name: error-strings
      - name: error-naming

	"github.com/minio/minio-go/v7/pkg/set"
	"github.com/minio/minio/internal/auth"
	"github.com/minio/minio/internal/hash/sha256"
	xhttp "github.com/minio/minio/internal/http"
)

// AWS Signature Version '4' constants.
const (
	signV4Algorithm = "AWS4-HMAC-SHA256"
	iso8601Format   = "20060102T150405Z"
	yyyymmdd        = "20060102"
)

type serviceType string

const (
	serviceS3  serviceType = "s3"

Чтобы увидеть все варианты, которые у вас есть, ознакомьтесь с документацией <a href="https://docs.pydantic.dev/latest/concepts/types/" class="external-link" target="_blank">по необычным типам Pydantic</a>. Вы увидите некоторые примеры в следующей главе.

```Python hl_lines="7"
{!../../docs_src/query_params_str_validations/tutorial006.py!}
```

/// info | "Informação"

Se você nunca viu os `...` antes: é um valor único especial, faz <a href="https://docs.python.org/3/library/constants.html#Ellipsis" class="external-link" target="_blank">parte do Python e é chamado "Ellipsis"</a>.

///

Dessa forma o **FastAPI** saberá que o parâmetro é obrigatório.

* 중첩 모델도 편집기 지원(자동완성 등)
* 데이터 변환
* 데이터 검증
* 자동 문서화

## 특별한 타입과 검증

`str`, `int`, `float` 등과 같은 단일 타입과는 별개로, `str`을 상속하는 더 복잡한 단일 타입을 사용할 수 있습니다.

모든 옵션을 보려면, <a href="https://docs.pydantic.dev/latest/concepts/types/" class="external-link" target="_blank">Pydantic's exotic types</a> 문서를 확인하세요. 다음 장에서 몇가지 예제를 볼 수 있습니다.

예를 들어 `Image` 모델 안에 `url` 필드를 `str` 대신 Pydantic의 `HttpUrl`로 선언할 수 있습니다:

```Python hl_lines="4  10"

Apart from normal singular types like `str`, `int`, `float`, etc. you can use more complex singular types that inherit from `str`.

To see all the options you have, checkout <a href="https://docs.pydantic.dev/latest/concepts/types/" class="external-link" target="_blank">Pydantic's Type Overview</a>. You will see some examples in the next chapter.

```
https://www.external.org/events/invoices/2expen51ve
```

com um corpo JSON contendo algo como:

```JSON
{
    "description": "Payment celebration",
    "paid": true
}
```

e esperaria uma resposta daquela *API externa* com um corpo JSON como:

```JSON
{

	QueueDir          string   `json:"queueDir"`
	QueueLimit        uint64   `json:"queueLimit"`
}

//lint:file-ignore ST1003 We cannot change these exported names.

// AMQP input constants.
const (
	AmqpQueueDir   = "queue_dir"
	AmqpQueueLimit = "queue_limit"

	AmqpURL               = "url"
	AmqpExchange          = "exchange"
	AmqpRoutingKey        = "routing_key"

    </pluginManagement>
  </build>
  <distributionManagement>
    <snapshotRepository>
      <id>sonatype-nexus-snapshots</id>
      <name>Sonatype Nexus Snapshots</name>
      <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
    </snapshotRepository>
    <repository>
      <id>sonatype-nexus-staging</id>
      <name>Nexus Release Repository</name>