# Parâmetros de consulta e validações de string { #query-parameters-and-string-validations }

O **FastAPI** permite declarar informações adicionais e validações para os seus parâmetros.

Vamos usar esta aplicação como exemplo:

{* ../../docs_src/query_params_str_validations/tutorial001_py310.py hl[7] *}

    tags: list[str] | None = None
    summary: str | None = None
    description: str | None = None
    externalDocs: ExternalDocumentation | None = None
    operationId: str | None = None
    parameters: list[Parameter | Reference] | None = None
    requestBody: RequestBody | Reference | None = None
    # Using Any for Specification Extensions
    responses: dict[str, Response | Any] | None = None

## Listen mit Typ-Parametern als Felder { #list-fields-with-type-parameter }

Aber Python erlaubt es, Listen mit inneren Typen, auch „Typ-Parameter“ genannt, zu deklarieren.

### Eine `list` mit einem Typ-Parameter deklarieren { #declare-a-list-with-a-type-parameter }

    private static class MockHttpServletRequest implements HttpServletRequest {
        private Map<String, String[]> parameters = new HashMap<>();
        private Map<String, String> singleParameters = new HashMap<>();

        public void setParameterValues(String name, String[] values) {
            parameters.put(name, values);
        }

        public void setParameter(String name, String value) {

## 여러 경로/쿼리 매개변수 { #multiple-path-and-query-parameters }

여러 경로 매개변수와 쿼리 매개변수를 동시에 선언할 수 있으며 **FastAPI**는 어느 것이 무엇인지 알고 있습니다.

그리고 특정 순서로 선언할 필요가 없습니다.

매개변수들은 이름으로 감지됩니다:

{* ../../docs_src/query_params/tutorial004_py310.py hl[6,8] *}

## 필수 쿼리 매개변수 { #required-query-parameters }

경로가 아닌 매개변수에 대한 기본값을 선언할 때(지금은 쿼리 매개변수만 보았습니다), 해당 매개변수는 필수적(Required)이지 않았습니다.

   *
   * @param iterator the iterator whose minimum element is to be determined
   * @throws NoSuchElementException if {@code iterator} is empty
   * @throws ClassCastException if the parameters are not <i>mutually comparable</i> under this
   *     ordering.
   * @since 11.0
   */
  @ParametricNullness
  public <E extends T> E min(Iterator<E> iterator) {

# Body – Felder { #body-fields }

So wie Sie zusätzliche Validierung und Metadaten in Parametern der *Pfadoperation-Funktion* mittels `Query`, `Path` und `Body` deklarieren, können Sie auch innerhalb von Pydantic-Modellen zusätzliche Validierung und Metadaten deklarieren, mittels Pydantics `Field`.

## `Field` importieren { #import-field }

Importieren Sie es zuerst:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}

/// warning | Achtung

Fonksiyonun içinde model nesnesinin tüm attribute'larına doğrudan erişebilirsiniz:

{* ../../docs_src/body/tutorial002_py310.py *}

## Request body + path parametreleri { #request-body-path-parameters }

Path parametrelerini ve request body'yi aynı anda tanımlayabilirsiniz.

### Request `POST` to plugin endpoint

Query parameters:

| Parameter Name | Value Type | Purpose                                                                 |
|----------------|------------|-------------------------------------------------------------------------|

    /** Logger instance for this class */
    private static final Logger logger = LogManager.getLogger(DataIndexHelper.class);

    /** Parameter key for controlling deletion of old documents */
    private static final String DELETE_OLD_DOCS = "delete_old_docs";

    /** Parameter key for controlling retention of expired documents */
    private static final String KEEP_EXPIRES_DOCS = "keep_expires_docs";

    /**