"price": {"title": "Price", "type": "number"},
                    },
                },
                "ResponseMessage": {
                    "title": "ResponseMessage",
                    "required": ["message"],
                    "type": "object",
                    "properties": {"message": {"title": "Message", "type": "string"}},
                },

from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float


class ResponseMessage(BaseModel):
    message: str


class User(BaseModel):
    username: str
    email: str


@app.post("/items/", response_model=ResponseMessage, tags=["items"])
async def create_item(item: Item):
    return {"message": "Item received"}

                        "name",
                        "price",
                    ],
                    "title": "Item",
                    "type": "object",
                },
                "ResponseMessage": {
                    "properties": {
                        "message": {
                            "title": "Message",
                            "type": "string",
                        },

                        "price": {"title": "Price", "type": "number"},
                    },
                },
                "ResponseMessage": {
                    "title": "ResponseMessage",
                    "required": ["message"],
                    "type": "object",
                    "properties": {"message": {"title": "Message", "type": "string"}},
                },

class Item(BaseModel):
    name: str
    price: float


class ResponseMessage(BaseModel):
    message: str


class User(BaseModel):
    username: str
    email: str


@app.post("/items/", response_model=ResponseMessage, tags=["items"])
async def create_item(item: Item):
    return {"message": "Item received"}

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float


class ResponseMessage(BaseModel):
    message: str


@app.post("/items/", response_model=ResponseMessage)
async def create_item(item: Item):
    return {"message": "item received"}


@app.get("/items/", response_model=list[Item])
async def get_items():
    return [

                        "price": {"title": "Price", "type": "number"},
                    },
                },
                "ResponseMessage": {
                    "title": "ResponseMessage",
                    "required": ["message"],
                    "type": "object",
                    "properties": {"message": {"title": "Message", "type": "string"}},
                },

## 生成一个 TypeScript 前端客户端

让我们从一个简单的 FastAPI 应用开始：

{* ../../docs_src/generate_clients/tutorial001_py39.py hl[7:9,12:13,16:17,21] *}

请注意，*路径操作* 定义了他们所用于请求数据和回应数据的模型，所使用的模型是`Item` 和 `ResponseMessage`。

### API 文档

如果您访问API文档，您将看到它具有在请求中发送和在响应中接收数据的**模式(schemas)**：

<img src="/img/tutorial/generate-clients/image01.png">

您可以看到这些模式，因为它们是用程序中的模型声明的。