```JSON
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,
        "tax": 3.2
    },
    "user": {
        "username": "dave",
        "full_name": "Dave Grohl"
    }
}
```

/// note | Hinweis

Beachten Sie, dass, obwohl `item` wie zuvor deklariert wurde, es nun unter einem Schlüssel `item` im Body erwartet wird.

///

Let's say you only have a single `item` body parameter from a Pydantic model `Item`.

By default, **FastAPI** will then expect its body directly.

But if you want it to expect a JSON with a key `item` and inside of it the model contents, as it does when you declare extra body parameters, you can use the special `Body` parameter `embed`:

```Python
item: Item = Body(embed=True)
```

as in:

	var r T
	return g.g.apply(ctx).Model(r).Rows()
}

func (c chainG[T]) processSet(items ...clause.Assigner) setCreateOrUpdateG[T] {
	var (
		assigns  []clause.Assignment
		assocOps []clause.Association
	)

	for _, item := range items {
		// Check if it's an AssociationAssigner
		if assocAssigner, ok := item.(clause.AssociationAssigner); ok {
			assocOps = append(assocOps, assocAssigner.AssociationAssignments()...)

이 예제를 실행하고 [http://127.0.0.1:8000/items/3](http://127.0.0.1:8000/items/3)을 열면, 다음 응답을 볼 수 있습니다:

```JSON
{"item_id":3}
```

/// check | 확인

함수가 받은(반환도 하는) 값은 문자열 `"3"`이 아니라 파이썬 `int` 형인 `3`입니다.

즉, 타입 선언을 하면 **FastAPI**는 자동으로 요청을 <dfn title="HTTP 요청에서 전달되는 문자열을 파이썬 데이터로 변환">"파싱"</dfn>합니다.

///

## 데이터 검증 { #data-validation }

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: Annotated[
        str | None,
        Query(
            title="Query string",
            description="Query string for the items to search in the database that have a good match",
            min_length=3,
        ),
    ] = None,
):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:

constraints.URL.message = {item} bukan URL yang valid.
constraints.Required.message = {item} wajib diisi.
constraints.TypeInteger.message = {item} harus berupa angka.
constraints.TypeLong.message = {item} harus berupa angka.
constraints.TypeFloat.message = {item} harus berupa angka.
constraints.TypeDouble.message = {item} harus berupa angka.
constraints.TypeAny.message = {item} tidak dapat dikonversi ke {propertyType}.

Suponha que você tem um único parâmetro de corpo `item`, a partir de um modelo Pydantic `Item`.

Por padrão, o **FastAPI** esperará que seu conteúdo venha no corpo diretamente.

Mas se você quiser que ele espere por um JSON com uma chave `item` e dentro dele os conteúdos do modelo, como ocorre ao declarar vários parâmetros de corpo, você pode usar o parâmetro especial de `Body` chamado `embed`:

```Python
item: Item = Body(embed=True)
```

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from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: str | None = Query(min_length=3)):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: str = Query(default="fixedquery", min_length=3)):
    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
    if q:
        results.update({"q": q})