The webhooks that you define will end up in the **OpenAPI** schema and the automatic **docs UI**.

/// info

The `app.webhooks` object is actually just an `APIRouter`, the same type you would use when structuring your app with multiple files.

///

///

The only new thing is the `callbacks=invoices_callback_router.routes` as an argument to the *path operation decorator*. We'll see what that is next.

## Documenting the callback { #documenting-the-callback }

The actual callback code will depend heavily on your own API app.

And it will probably vary a lot from one app to the next.

It could be just one or two lines of code, like:

```Python

* `name`
* `age`

{* ../../docs_src/sql_databases/tutorial002_an_py310.py ln[7:9] hl[7:9] *}

#### `Hero` - the *table model* { #hero-the-table-model }

Then let's create `Hero`, the actual *table model*, with the **extra fields** that are not always in the other models:

* `id`
* `secret_name`

```

Using `Optional[str]` instead of just `str` will let the editor help you detect errors where you could be assuming that a value is always a `str`, when it could actually be `None` too.

`Optional[Something]` is actually a shortcut for `Union[Something, None]`, they are equivalent.

This also means that in Python 3.10, you can use `Something | None`:

//// tab | Python 3.10+

```Python hl_lines="1"

        int expected = Byte.compare(x, y);
        int actual = SignedBytes.compare(x, y);
        if (expected == 0) {
          assertWithMessage("%s, %s", x, y).that(actual).isEqualTo(expected);
        } else if (expected < 0) {
          assertWithMessage("%s, %s (expected: %s, actual%s)", x, y, expected, actual)
              .that(actual < 0)
              .isTrue();
        } else {

# Obtener Usuario Actual { #get-current-user }

En el capítulo anterior, el sistema de seguridad (que se basa en el sistema de inyección de dependencias) le estaba dando a la *path operation function* un `token` como un `str`:

{* ../../docs_src/security/tutorial001_an_py39.py hl[12] *}

Pero eso aún no es tan útil. Vamos a hacer que nos dé el usuario actual.

## Crear un modelo de usuario { #create-a-user-model }

	for _, tc := range testCases {
		actual := f([]byte(tc.in))
		if actual == nil && tc.out != nil {
			t.Errorf("%s(%q) = nil; want %q", funcName, tc.in, tc.out)
		}
		if actual != nil && tc.out == nil {
			t.Errorf("%s(%q) = %q; want nil", funcName, tc.in, actual)
		}
		if !Equal(actual, tc.out) {
			t.Errorf("%s(%q) = %q; want %q", funcName, tc.in, actual, tc.out)
		}
	}
}

     * Verifies that {@code projectManager.attachArtifact(…)} throws an exception,
     * and that the expecption message contains the expected and actual <abbr>GAV</abbr>.
     *
     * @param expectedGAV the actual <abbr>GAV</abbr> that the exception message should contain
     * @param actualGAV the actual <abbr>GAV</abbr> that the exception message should contain
     */

                    "tax": 3.2,
                },
            },
            "converted": {
                "summary": "An example with converted data",
                "description": "FastAPI can convert price `strings` to actual `numbers` automatically",
                "value": {
                    "name": "Bar",
                    "price": "35.4",
                },
            },
            "invalid": {

        int expected = Short.compare(x, y);
        int actual = Shorts.compare(x, y);
        if (expected == 0) {
          assertWithMessage("%s, %s", x, y).that(actual).isEqualTo(expected);
        } else if (expected < 0) {
          assertWithMessage("%s, %s (expected: %s, actual%s)", x, y, expected, actual)
              .that(actual < 0)
              .isTrue();
        } else {