Dans l'exemple précédent, les opérations de routage attendaient un body JSON avec les attributs d'un `Item`, par exemple :

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2
}
```

Mais vous pouvez également déclarer plusieurs paramètres provenant de body, par exemple `item` et `user` simultanément :

//// tab | Python 3.10+

```Python hl_lines="20"

                                "schema": IsDict(
                                    {
                                        "$ref": "#/components/schemas/Item",
                                        "examples": [
                                            {
                                                "name": "Foo",
                                                "description": "A very nice Item",

                                "schema": IsDict(
                                    {
                                        "$ref": "#/components/schemas/Item",
                                        "examples": [
                                            {
                                                "name": "Foo",
                                                "description": "A very nice Item",

 * is desired.
 *
 * <p>
 * <table border="1" cellpadding="3" cellspacing="0" width="100%" summary="Usage examples">
 * <tr bgcolor="#ccccff">
 * <td colspan="2"><b><code>SmbNamedPipe</code> Constructor Examples</b></td>
 * <tr>
 * <td width="20%"><b>Code Sample</b></td>
 * <td><b>Description</b></td>
 * </tr>
 * <tr>
 * <td width="20%">
 * 
 * <pre>

                                "schema": IsDict(
                                    {
                                        "$ref": "#/components/schemas/Item",
                                        "examples": [
                                            {
                                                "name": "Foo",
                                                "description": "A very nice Item",

nationality, personal appearance, race, religion, or sexual identity
and orientation.

We pledge to act and interact in ways that contribute to an open, welcoming,
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## Our Standards

Examples of behavior that contributes to a positive environment for our
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* Demonstrating empathy and kindness toward other people
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app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None

    class Config:
        schema_extra = {
            "examples": [
                {
                    "name": "Foo",
                    "description": "A very nice Item",
                    "price": 35.4,
                    "tax": 3.2,
                }
            ]

Por exemplo, se você precisar armazená-lo em um banco de dados.

Para isso, **FastAPI** fornece uma função `jsonable_encoder()`.

## Usando a função `jsonable_encoder`

Vamos imaginar que você tenha um banco de dados `fake_db` que recebe apenas dados compatíveis com JSON.

Por exemplo, ele não recebe objetos `datetime`, pois estes objetos não são compatíveis com JSON.

    description: Union[str, None] = None
    price: float
    tax: Union[float, None] = None


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,
    item: Item = Body(
        examples=[
            {
                "name": "Foo",
                "description": "A very nice Item",
                "price": 35.4,
                "tax": 3.2,
            },
            {

    price: float
    tax: Union[float, None] = None


@app.put("/items/{item_id}")
async def update_item(
    *,
    item_id: int,
    item: Annotated[
        Item,
        Body(
            examples=[
                {
                    "name": "Foo",
                    "description": "A very nice Item",
                    "price": 35.4,
                    "tax": 3.2,
                },
                {