Supongamos que solo tienes un único parámetro de cuerpo `item` de un modelo Pydantic `Item`.

Por defecto, **FastAPI** esperará su cuerpo directamente.

Pero si deseas que espere un JSON con una clave `item` y dentro de ella los contenidos del modelo, como lo hace cuando declaras parámetros de cuerpo extra, puedes usar el parámetro especial `Body` `embed`:

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

como en:

<div class="announce-wrapper">
  <div id="announce-left">
    <div class="item">
      <a class="announce-link" href="https://x.com/fastapi" target="_blank">
        <span class="twemoji">
          {% include ".icons/fontawesome/brands/x-twitter.svg" %}
        </span> Follow <strong>@fastapi</strong> on <strong>X (Twitter)</strong> to stay updated
      </a>
    </div>
    <div class="item">

p-item-primary{color:#004085;background-color:#b8daff}.list-group-item-primary.list-group-item-action:focus,.list-group-item-primary.list-group-item-action:hover{color:#004085;background-color:#9fcdff}.list-group-item-primary.list-group-item-action.active{color:#fff;background-color:#004085;border-color:#004085}.list-group-item-secondary{color:#383d41;background-color:#d6d8db}.list-group-item-secondary.list-group-item-action:focus,.list-group-item-secondary.list-group-item-action:hover{color:#38...

        List<SuggestItem> items = defaultContentsParser.parseQueryLog(queryLog, supportedFields, tagFieldNames, roleFieldName,
                createDefaultReadingConverter(), createDefaultNormalizer());
        SuggestItem item = items.get(0);
        assertEquals("検索エンジン", item.getText());
        assertEquals(SuggestItem.Kind.QUERY, item.getKinds()[0]);
        assertEquals(1, item.getQueryFreq());
    }

# ---------------
constraints.AssertFalse.message = {item}는 false여야 합니다.
constraints.AssertTrue.message = {item}는 true여야 합니다.
constraints.DecimalMax.message = {item}는 {value}보다 작아야 합니다.
constraints.DecimalMin.message = {item}는 {value}보다 커야 합니다.
constraints.Digits.message = {item}는 숫자여야 합니다. (기대값: <숫자>.<숫자>)
constraints.Future.message = {item}는 미래의 값이어야 합니다.
constraints.Max.message = {item}는 {value} 이하여야 합니다.

     * Creates a new dictionary item with default values.
     */
    public DictionaryItem() {
        // Default constructor
    }

    /**
     * Gets the unique identifier for this dictionary item.
     *
     * @return the ID of this dictionary item
     */
    public long getId() {
        return id;
    }

                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item"><la:link href="/admin/dict">
                                <la:message key="labels.dict_list_link"/>
                            </la:link></li>
                            <li class="breadcrumb-item"><la:link href="../list/1/?dictId=${f:u(dictId)}">
                                <la:message key="labels.dict_protwords_list_link"/>

constraints.URL.message = {item} is not a valid URL.
constraints.Required.message = {item} is required.
constraints.TypeInteger.message = {item} must be a number.
constraints.TypeLong.message = {item} must be a number.
constraints.TypeFloat.message = {item} must be a number.
constraints.TypeDouble.message = {item} must be a number.
constraints.TypeAny.message = {item} cannot be converted to {propertyType}.
constraints.UriType.message = {item} has an unrecognized URI.

constraints.URL.message = {item} is not a valid URL.
constraints.Required.message = {item} is required.
constraints.TypeInteger.message = {item} must be a number.
constraints.TypeLong.message = {item} must be a number.
constraints.TypeFloat.message = {item} must be a number.
constraints.TypeDouble.message = {item} must be a number.
constraints.TypeAny.message = {item} cannot be converted to {propertyType}.
constraints.UriType.message = {item} has an unrecognized URI.

    //                                               -------
    /**
     * Displays the details view for a specific synonym item.
     *
     * @param dictId the dictionary ID
     * @param crudMode the CRUD operation mode
     * @param id the synonym item ID
     * @return HTML response for the synonym item details
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })