{!../../../docs_src/sql_databases/sql_app/models.py!}
```

When accessing the attribute `items` in a `User`, as in `my_user.items`, it will have a list of `Item` SQLAlchemy models (from the `items` table) that have a foreign key pointing to this record in the `users` table.

When you access `my_user.items`, SQLAlchemy will actually go and fetch the items from the database in the `items` table and populate them here.

* `summary`: Short description for the example.
* `description`: A long description that can contain Markdown text.
* `value`: This is the actual example shown, e.g. a `dict`.
* `externalValue`: alternative to `value`, a URL pointing to the example. Although this might not be supported by as many tools as `value`.

You can use it like this:

=== "Python 3.10+"

    ```Python hl_lines="23-49"

Uvicorn est un serveur ASGI rapide comme l'éclair, basé sur uvloop et httptools.

Il ne s'agit pas d'un framework web, mais d'un serveur. Par exemple, il ne fournit pas d'outils pour le routing. C'est
quelque chose qu'un framework comme Starlette (ou **FastAPI**) fournirait par-dessus.

C'est le serveur recommandé pour Starlette et **FastAPI**.

!!! check "**FastAPI** le recommande comme"

import warnings
from typing import List

from fastapi import APIRouter, FastAPI
from fastapi.routing import APIRoute
from fastapi.testclient import TestClient
from pydantic import BaseModel


def custom_generate_unique_id(route: APIRoute):
    return f"foo_{route.name}"


def custom_generate_unique_id2(route: APIRoute):
    return f"bar_{route.name}"


def custom_generate_unique_id3(route: APIRoute):