FastAPI 怎么更好的返回自定义的格式

[holinhot]

官方文档是用 response_model，但感觉 这个好像不是很灵活。

我想要返回的统一格式, 把 pydantic 的验证错误也包进自己定义的格式里

pydantic 默认数据返回格式格式：

{
  "email": "[e-mail]",
  "id": 6,
  "is_active": true,
  "item": []
}

pydantic 默认验证错误格式：

{
  "detail": [
    {
      "loc": [
        "body",
        "user",
        "email"
      ],
      "msg": "value is not a valid email address",
      "type": "value_error.email"
    }
  ]
}

这种返回格式缺乏规范性，后面调用接口时就非常乱了。

我想要返回的统一格式统一成下面这样，方便调用和判断错误

{
"success": true,
"time": "1588633541",
"errors": "",
"result": {
  "username": "bigbig",
  "created_at": "2020-05-04 21:57:22.815393"
}
}

{
"success": false,
"time": "1588633541",
"errors": {
  "msg": "Authorization failed",
  "errors": {"detail": "wrong user name or password"}
},
"result": ""
}

{
"success": false,
"time": "1588633541",
"errors": {"detail": [
    {
      "loc": [
        "body",
        "user",
        "email"
      ],
      "msg": "value is not a valid email address",
      "type": "value_error.email"
    }
  ]},
"result": ""
}

[holinhot]

错误返回格式看文档可以改了

```
@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
return JSONResponse(
status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
content=jsonable_encoder(
{
"success": False,
"errors": exc.errors(),
"result": "",
"body": exc.body
}
)
)
```

```
{
"success": false,
"errors": [
{
"loc": [
"body",
"user",
"email"
],
"msg": "value is not a valid email address",
"type": "value_error.email"
}
],
"result": "",
"body": {
"email": "user522example.com",
"password": "string"
}
}
```

response_model 还在研究，不然就只能不用 response_model，完全自己返回 json 内容了

[holinhot]

仔细研究已搞定
```
class User(UserBase):
id: int
is_active: bool
item: List[Item] = []

class Config:
orm_mode = True

class Standard_result_format(BaseModel):
success: bool = True
errors: list = []
result: User
```

是可以在下面调用另一下 BaseModel class

[holinhot]

改了错误格式后自动生成的文档是一个应该是