来源：https://github.com/bauerji/flask-pydantic

1. 安装 flask-pydantic

python3 -m pip install Flask-Pydantic

validate 装饰器支持的参数类型： 1. request 1. URL的 path 参数

1.1 request 参数

1.2 URL 参数

@app.route("/users/<user_id>", methods=["GET"])
@validate()
def get_user(user_id: str):
    pass

2. 使用 flask-pydantic

2.1 Query parameters only

from typing import Optional
from flask import Flask, request
from pydantic import BaseModel

from flask_pydantic import validate

app = Flask("flask_pydantic_app")

class QueryModel(BaseModel):
  age: int

class ResponseModel(BaseModel):
  id: int
  age: int
  name: str
  nickname: Optional[str] = None

# Example 1: query parameters only
@app.route("/", methods=["GET"])
@validate()
def get(query: QueryModel):
  age = query.age
  return ResponseModel(
    age=age,
    id=0, name="abc", nickname="123"
    )

测试方式

curl --location --request GET 'http://127.0.0.1:5000/'

2.2 URL path parameter

@app.route("/character/<character_id>/", methods=["GET"])
@validate()
def get_character(character_id: int):
    characters = [
        ResponseModel(id=1, age=95, name="Geralt", nickname="White Wolf"),
        ResponseModel(id=2, age=45, name="Triss Merigold", nickname="sorceress"),
        ResponseModel(id=3, age=42, name="Julian Alfred Pankratz", nickname="Jaskier"),
        ResponseModel(id=4, age=101, name="Yennefer", nickname="Yenn"),
    ]
    try:
        return characters[character_id]
    except IndexError:
        return {"error": "Not found"}, 400

2.3 Request body only

class RequestBodyModel(BaseModel):
  name: str
  nickname: Optional[str] = None

# Example2: request body only
@app.route("/", methods=["POST"])
@validate()
def post(body: RequestBodyModel):
  name = body.name
  nickname = body.nickname
  return ResponseModel(
    name=name, nickname=nickname,id=0, age=1000
    )

2.4 BOTH query paramaters and request body

# Example 3: both query paramters and request body
@app.route("/both", methods=["POST"])
@validate()
def get_and_post(body: RequestBodyModel,query: QueryModel):
  name = body.name # From request body
  nickname = body.nickname # From request body
  age = query.age # from query parameters
  return ResponseModel(
    age=age, name=name, nickname=nickname,
    id=0
  )

2.5 Request form-data only

class RequestFormDataModel(BaseModel):
  name: str
  nickname: Optional[str] = None

# Example2: request body only
@app.route("/", methods=["POST"])
@validate()
def post(form: RequestFormDataModel):
  name = form.name
  nickname = form.nickname
  return ResponseModel(
    name=name, nickname=nickname,id=0, age=1000
    )