<label for="parameters" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.webauth_parameters"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="parameters"/>
                                        <la:textarea styleId="parameters" property="parameters"

```Python hl_lines="17  22  24-27"
{!> ../../docs_src/response_model/tutorial001.py!}
```

////

/// note

Notice that `response_model` is a parameter of the "decorator" method (`get`, `post`, etc). Not of your *path operation function*, like all the parameters and body.

///

@pytest.fixture(name="client")
def get_client():
    from docs_src.schema_extra_example.tutorial004_an_py39 import app

    client = TestClient(app)
    return client


# Test required and embedded body parameters with no bodies sent
@needs_py39
def test_post_body_example(client: TestClient):
    response = client.put(
        "/items/5",
        json={
            "name": "Foo",
            "description": "A very nice Item",

@pytest.fixture(name="client")
def get_client():
    from docs_src.schema_extra_example.tutorial004_py310 import app

    client = TestClient(app)
    return client


# Test required and embedded body parameters with no bodies sent
@needs_py310
def test_post_body_example(client: TestClient):
    response = client.put(
        "/items/5",
        json={
            "name": "Foo",

@pytest.fixture(name="client")
def get_client():
    from docs_src.schema_extra_example.tutorial004_an_py310 import app

    client = TestClient(app)
    return client


# Test required and embedded body parameters with no bodies sent
@needs_py310
def test_post_body_example(client: TestClient):
    response = client.put(
        "/items/5",
        json={
            "name": "Foo",

                            },
                        },
                    },
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "parameters": [
                        {
                            "required": False,
                            "schema": IsDict(
                                {

# Body - Fields

The same way you can declare additional validation and metadata in *path operation function* parameters with `Query`, `Path` and `Body`, you can declare validation and metadata inside of Pydantic models using Pydantic's `Field`.

## Import `Field`

First, you have to import it:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}


/// warning

import java.io.File
import java.io.FileOutputStream
import java.util.jar.JarFile
import java.util.jar.JarOutputStream


@CacheableTransform
abstract class Minify : TransformAction<Minify.Parameters> {

    interface Parameters : TransformParameters {
        @get:Input
        var keepClassesByArtifact: Map<String, Set<String>>
    }

    @get:PathSensitive(PathSensitivity.NAME_ONLY)
    @get:InputArtifact

  private static final String E13 = "1-3";

  private final EdgeType edgeType;
  private final MutableNetwork<Integer, String> network;

  // add parameters: directed/undirected
  @Parameters
  public static Collection<Object[]> parameters() {
    return Arrays.asList(new Object[][] {{EdgeType.UNDIRECTED}, {EdgeType.DIRECTED}});
  }

  public NetworkEquivalenceTest(EdgeType edgeType) {
    this.edgeType = edgeType;

  private static final String E13 = "1-3";

  private final EdgeType edgeType;
  private final MutableNetwork<Integer, String> network;

  // add parameters: directed/undirected
  @Parameters
  public static Collection<Object[]> parameters() {
    return Arrays.asList(new Object[][] {{EdgeType.UNDIRECTED}, {EdgeType.DIRECTED}});
  }

  public NetworkEquivalenceTest(EdgeType edgeType) {
    this.edgeType = edgeType;