app = FastAPI()


class UserIn(BaseModel):
    username: str
    password: str
    email: EmailStr
    full_name: Union[str, None] = None


class UserOut(BaseModel):
    username: str
    email: EmailStr
    full_name: Union[str, None] = None


@app.post("/user/", response_model=UserOut)
async def create_user(user: UserIn) -> Any:

                            "items": {"$ref": "#/components/schemas/ValidationError"},
                        }
                    },
                },
                "UserIn": {
                    "title": "UserIn",
                    "required": ["username", "email", "password"],
                    "type": "object",
                    "properties": {

from pydantic import BaseModel, EmailStr

app = FastAPI()


class UserIn(BaseModel):
    username: str
    password: str
    email: EmailStr
    full_name: str | None = None


class UserOut(BaseModel):
    username: str
    email: EmailStr
    full_name: str | None = None


@app.post("/user/", response_model=UserOut)
async def create_user(user: UserIn) -> Any:

                            {"title": "Full Name", "type": "string"}
                        ),
                    },
                },
                "UserIn": {
                    "title": "UserIn",
                    "required": ["username", "password", "email"],
                    "type": "object",
                    "properties": {

`BaseUser` has the base fields. Then `UserIn` inherits from `BaseUser` and adds the `password` field, so, it will include all the fields from both models.

We annotate the function return type as `BaseUser`, but we are actually returning a `UserIn` instance.

`BaseUser` verfügt über die Basis-Felder. Dann erbt `UserIn` von `BaseUser` und fügt das Feld `Passwort` hinzu, sodass dass es nun alle Felder beider Modelle hat.

Wir annotieren den Funktionsrückgabetyp als `BaseUser`, geben aber tatsächlich eine `UserIn`-Instanz zurück.

```

////

### 🔃 `**user_in.dict()`

#### Pydantic `.dict()`

`user_in` Pydantic 🏷 🎓 `UserIn`.

Pydantic 🏷 ✔️ `.dict()` 👩‍🔬 👈 📨 `dict` ⏮️ 🏷 💽.

, 🚥 👥 ✍ Pydantic 🎚 `user_in` 💖:

```Python
user_in = UserIn(username="john", password="secret", email="******@****.***")
```

& ⤴️ 👥 🤙:

```Python
user_dict = user_in.dict()
```

❔ 🔨 👉 👷 ❓ ➡️ ✅ 👈 👅. 👶

### 🆎 ✍ & 🏭

🥇 ➡️ 👀 ❔ 👨‍🎨, ✍ & 🎏 🧰 🔜 👀 👉.

`BaseUser` ✔️ 🧢 🏑. ⤴️ `UserIn` 😖 ⚪️➡️ `BaseUser` & 🚮 `password` 🏑,, ⚫️ 🔜 🔌 🌐 🏑 ⚪️➡️ 👯‍♂️ 🏷.

👥 ✍ 🔢 📨 🆎 `BaseUser`, ✋️ 👥 🤙 🛬 `UserIn` 👐.

👨‍🎨, ✍, & 🎏 🧰 🏆 🚫 😭 🔃 👉 ↩️, ⌨ ⚖, `UserIn` 🏿 `BaseUser`, ❔ ⛓ ⚫️ *☑* 🆎 🕐❔ ⚫️❔ ⌛ 🕳 👈 `BaseUser`.

### FastAPI 💽 🖥

У модели `BaseUser` есть некоторые поля. Затем `UserIn` наследуется от `BaseUser` и добавляет новое поле `password`. Таким образом модель будет включать в себя все поля из первой модели (родителя), а также свои собственные.

Мы аннотируем возвращаемый тип функции как `BaseUser`, но фактически мы будем возвращать объект типа `UserIn`.

///

### About `**user_in.dict()`

#### Pydantic's `.dict()`

`user_in` is a Pydantic model of class `UserIn`.

Pydantic models have a `.dict()` method that returns a `dict` with the model's data.

So, if we create a Pydantic object `user_in` like:

```Python
user_in = UserIn(username="john", password="secret", email="******@****.***")
```

and then we call:

```Python