!function(a,b){"function"==typeof define&&define.amd?define(["jquery"],function(a){return b(a)}):"object"==typeof module&&module.exports?module.exports=b(require("jquery")):b(a.jQuery)}(this,function(a){!function(a,b){"use strict";a.formUtils.registerLoadedModule("lang/it"),a(b).bind("validatorsLoaded",function(){a.formUtils.LANG={errorTitle:"Impossibile inviare il modulo!",requiredField:"Campo obbligatorio",requiredFields:"Non sono stati compilati tutti i campi richiesti",badTime:"L'ora scelta...

    from pydantic import BaseModel, ValidationInfo, field_validator

    app = FastAPI()

    class ModelB(BaseModel):
        username: str

    class ModelC(ModelB):
        password: str

    class ModelA(BaseModel):
        name: str
        description: Optional[str] = None
        foo: ModelB

        @field_validator("name")
        def lower_username(cls, name: str, info: ValidationInfo):

```Python
from app.routers import items, users
```

Um mehr über Python-Packages und -Module zu erfahren, lesen Sie <a href="https://docs.python.org/3/tutorial/modules.html" class="external-link" target="_blank">die offizielle Python-Dokumentation über Module</a>.

///

### Namenskollisionen vermeiden

Wir importieren das Submodul `items` direkt, anstatt nur seine Variable `router` zu importieren.

                    },
                }
            },
            "/response_model_model1-annotation_model2-return_same_model": {
                "get": {
                    "summary": "Response Model Model1 Annotation Model2 Return Same Model",
                    "operationId": "response_model_model1_annotation_model2_return_same_model_response_model_model1_annotation_model2_return_same_model_get",
                    "responses": {

# OpenAPI `models`

OpenAPI Pydantic models used to generate and validate the generated OpenAPI.

import peewee

from .database import db


class User(peewee.Model):
    email = peewee.CharField(unique=True, index=True)
    hashed_password = peewee.CharField()
    is_active = peewee.BooleanField(default=True)

    class Meta:
        database = db


class Item(peewee.Model):
    title = peewee.CharField(index=True)
    description = peewee.CharField(index=True)
    owner = peewee.ForeignKeyField(User, backref="items")

Andrew Harp <******@****.***> 1484086825 -0800

Vamos imaginar que o carregamento do modelo pode **demorar bastante tempo**, porque ele tem que ler muitos **dados do disco**. Então você não quer fazer isso a cada requisição.

 ╭─ <font color="#8AE234"><b>Python module file</b></font> ─╮
 │                      │
 │  🐍 main.py          │
 │                      │
 ╰──────────────────────╯

<font color="#3465A4">INFO    </font> Importing module <font color="#4E9A06">main</font>
<font color="#3465A4">INFO    </font> Found importable FastAPI app

```Python hl_lines="13"
{!> ../../docs_src/body_nested_models/tutorial008_py39.py!}
```

////

## 👨‍🎨 🐕‍🦺 🌐

& 👆 🤚 👨‍🎨 🐕‍🦺 🌐.

🏬 🔘 📇:

<img src="/img/tutorial/body-nested-models/image01.png">

👆 🚫 🚫 🤚 👉 😇 👨‍🎨 🐕‍🦺 🚥 👆 👷 🔗 ⏮️ `dict` ↩️ Pydantic 🏷.

✋️ 👆 🚫 ✔️ 😟 🔃 👫 👯‍♂️, 📨 #️⃣ 🗜 🔁 &amp; 👆 🔢 🗜 🔁 🎻 💁‍♂️.

## 💪 ❌ `dict`Ⓜ