fields_to_extract = get_cached_model_fields(first_field.type_)
        single_not_embedded_field = True
        # If headers are in a Pydantic model, the way to disable convert_underscores
        # would be with Header(convert_underscores=False) at the Pydantic model level
        default_convert_underscores = getattr(
            first_field.field_info, "convert_underscores", True
        )

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

    subgraph core["core platform"]

        core_runtime["core-runtime module"]
        style core_runtime stroke:#1abc9c,fill:#b1f4e7,stroke-width:2px,color:#000;

        core_configuration["core-configuration module"]
        style core_configuration stroke:#1abc9c,fill:#b1f4e7,stroke-width:2px,color:#000;

        core_execution["core-execution module"]
        style core_execution stroke:#1abc9c,fill:#b1f4e7,stroke-width:2px,color:#000;

import com.google.inject.Binder;
import com.google.inject.Module;
import com.google.inject.name.Names;
import org.apache.maven.api.services.Interpolator;
import org.apache.maven.api.xml.XmlNode;
import org.apache.maven.extension.internal.CoreExtensionEntry;
import org.apache.maven.impl.model.DefaultInterpolator;
import org.apache.maven.internal.xml.XmlPlexusConfiguration;
import org.apache.maven.model.v4.MavenTransformer;

     * a model source such as a string or input stream.
     *
     * @return an optional containing the source of the project, or empty if not specified
     */
    @Nonnull
    Optional<Source> getSource();

    /**
     * Determines whether a stub model should be allowed when the POM is missing or unreadable.

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import org.apache.commons.jxpath.ri.QName;
import org.apache.commons.jxpath.ri.model.NodeIterator;
import org.apache.commons.jxpath.ri.model.NodePointer;
import org.apache.maven.api.xml.XmlNode;

/**
 * An attribute iterator for JXPath to support <code>Xpp3Dom</code>.
 *
 */

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.repository.internal;

import org.apache.maven.model.Repository;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.repository.RepositoryPolicy;

    }

    //
    // Taken from LegacyRepositorySystem
    //

    public static org.apache.maven.model.Repository fromSettingsRepository(
            org.apache.maven.settings.Repository settingsRepository) {
        org.apache.maven.model.Repository modelRepository = new org.apache.maven.model.Repository();
        modelRepository.setId(settingsRepository.getId());

 * limitations under the License.
 */
package gradlebuild.docs.dsl.source

import gradlebuild.docs.dsl.source.model.ClassMetaData
import gradlebuild.docs.model.ClassMetaDataRepository
import spock.lang.Specification
import gradlebuild.docs.dsl.source.model.TypeMetaData

class TypeNameResolverTest extends Specification {
    final ClassMetaDataRepository<ClassMetaData> metaDataRepository = Mock()

import org.junit.jupiter.api.Test
import org.mockserver.client.MockServerClient
import org.mockserver.configuration.Configuration
import org.mockserver.logging.MockServerLogger
import org.mockserver.model.HttpRequest.request
import org.mockserver.model.HttpResponse.response
import org.mockserver.socket.tls.KeyStoreFactory
import org.testcontainers.containers.MockServerContainer
import org.testcontainers.junit.jupiter.Container