In this case, **FastAPI** will notice that there is more than one body parameter in the function (there are two parameters that are Pydantic models).

So, it will then use the parameter names as keys (field names) in the body, and expect a body like:

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

        }
    }

    @Test
    public void test_searchEngineClient_injection() {
        // Test SearchEngineClient field injection
        ThumbnailGenerator generator = new ThumbnailGenerator();
        assertNull(generator.searchEngineClient);

        // After proper initialization, it should be injected

            this.subject = subject;
            this.failOnRefresh = failOnRefresh;
        }

        @Override
        public TestCredentials clone() {
            // Return a shallow copy with the same field values
            return new TestCredentials(this.domain, this.anonymous, this.guest, this.subject, this.failOnRefresh);
        }

        @Override

If you want to read more about these encodings and form fields, head to the [<abbr title="Mozilla Developer Network">MDN</abbr> web docs for `POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST).

///

/// warning

                // facet field
                if (facetResponse.getFieldList() != null) {
                    facetField = facetResponse.getFieldList().stream().map(field -> {
                        final Map<String, Object> fieldMap = new HashMap<>(2, 1f);
                        fieldMap.put("name", field.getName());
                        fieldMap.put("result", field.getValueCountMap().entrySet().stream().map(e -> {

   * without it because it is an immutable object in a volatile field. This is desirable so that
   * methods like {@link #state}, {@link #failureCause} and notably {@link #toString} can be run
   * without grabbing the lock.
   *
   * <p>To update this field correctly the lock must be held to guarantee that the state is
   * consistent.
   */

    @Mock
    private SmbTransport transport;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        // Setup transport fields that are accessed directly
        transport.tconHostName = "testHost";
        // Setup session.transport field (accessed directly in SmbTree)
        session.transport = transport;
        // Setup session to return transport via method call

            MIEName a = new MIEName(oid, null);
            MIEName b = new MIEName(oid, null);
            assertEquals(a, b);
            assertNull(a.toString()); // toString returns field as-is
        }

        @Test
        void notEqualWhenOidDiffersOrNameNullityDiffers() {
            MIEName a = new MIEName(new ASN1ObjectIdentifier("1.2.3"), "X");

You can achieve that using [Pydantic's `AfterValidator`](https://docs.pydantic.dev/latest/concepts/validators/#field-after-validator) inside of `Annotated`.

/// tip

Pydantic also has [`BeforeValidator`](https://docs.pydantic.dev/latest/concepts/validators/#field-before-validator) and others. 🤓

///

 *   <li>TRACE</li>
 * </ul>
 *
 * <p>The Curl class also defines an enum {@link Method} which lists all supported HTTP methods.</p>
 *
 * <p>The temporary directory used by Curl is defined by the {@code tmpDir} field, which is initialized
 * to the system's temporary directory.</p>
 */
public class Curl {

    /**
     * The temporary directory used by Curl. It is initialized to the system's temporary directory.
     */