使用带有 POST 的 id 在数据库中创建新任务

Question

我正在尝试根据我将放入 url 的 todo_ID 在我的数据库中创建一个新任务。我可以完全在数据库中发布一个新任务，但我希望服务器选择 todo_ID，所以如果一个人在 url 中键入 /1，它将创建一个 todo_ID = 1 的新任务，并根据什么填写 UserID 和详细信息用户放入。问题是我不知道如何根据 todo_ID 来做，所以有人可以告诉我如何：D

from flask import Flask, jsonify,json, request, abort
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config.from_pyfile('Config.py')
db = SQLAlchemy(app)


class User(db.Model, JsonModel): #Class which is a model for the User table in the database
    User_ID = db.Column(db.Integer, primary_key = True)
    FirstName = db.Column(db.String(20))
    LastName = db.Column(db.String(20))

    def __init__(self,User_ID,FirstName, LastName):
        self.User_ID = User_ID
        self.FirstName = FirstName
        self.LastName = LastName

class Todo(db.Model, JsonModel):    #Class which is a model for the Todo table in the database
    todo_ID = db.Column(db.Integer, primary_key = True)
    UserID = db.Column(db.Integer, db.ForeignKey("user.User_ID"))
    details = db.Column(db.String(30))

    def __init__(self, UserID, details):
        self.UserID = UserID
        self.details = details


  @app.route('/<int:todo_ID>', methods = ['POST'])  #Uses POST method with same URL as GET method to add new information to Todo table.
def create_dev(todo_ID):
    id = Todo.query.create(todo_ID)
    dev = request.json["UserID"],request.json["details"]
    db.session.add(id,dev)
    db.session.commit()
    return "New task has been created.", 201


@app.before_first_request #Creates everything before the first request.
def startup():
    db.create_all()

if __name__ == '__main__':
    app.run()

Answer 1

试试

dev.UserID = request.POST["UserID"]

要使 request.json 工作，请将内容类型设置为 application/json。来自Flask documentation

如果 mimetype 是 application/json 这将包含已解析的 JSON 数据。否则这将是无。

更多详情：https://stackoverflow.com/a/20001283/3930114

编辑 1：基于 cmets 讨论的解决方案

@app.route('/<int:todo_ID>', methods = ['POST'])  #Uses POST method    with same URL as GET method to add new information to Todo table.
# Setting todo_ID default to None
def create_dev(todo_ID=None):
    # This if will allow you to not pass id via url and handle in backend. Frankly, first integer field will automatically become autoincrement field in Flask, so I am not even sure why you want to send todo_ID via url but I dont have enough information about your app :)
    if todo_ID is None:
        # write logic to create a todo_ID
        pass
    # Instance of model task
    dev.UserID = request.json["UserID"]
    dev.details = request.json["details"]
    t = Task(todo_ID, dev.UserID, dev.details)
    db.session.add(t)
    db.session.commit()
    return "New task has been created with todo_ID: " + todo_ID, 201

编辑 2：基于 cmets 中的附加信息的解决方案

@app.route('/', methods = ['POST'])  #Uses POST method    with same URL as GET method to add new information to Todo table.
# Setting todo_ID default to None
def create_dev():
    # Instance of model task
    t = Todo(UserID=request.json["UserID"], details=request.json["details"])
    db.session.add(t)
    db.session.commit()
    return "New task has been created with todo_ID: " + todo_ID, 201

PS：我没有测试过这段代码。

参考资料：

• http://flask-sqlalchemy.pocoo.org/2.1/queries/
• Flask Optional URL parameters