获取类型的对象不是JSON可序列化的

Question

POST请求成功，数据发布到数据库，但我总是收到此错误。

TypeError: Object of type User is not JSON serializable

尝试使它成为__dict__，但后来创造了不同的错误。如何阻止此错误？

在我的schema.py文件中

from flask import Flask
from app import db, ma
import os

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    first_name = db.Column(db.String(30), unique=False)
    last_name = db.Column(db.String(30), unique=False)
    email = db.Column(db.String(120), unique=True)
    specialization = db.Column(db.String(50), unique=False)
    user_type = db.Column(db.String(20), unique=False)

    def __init__(self, first_name, last_name, email, specialization, user_type):
        self.first_name = first_name
        self.last_name = last_name
        self.email = email
        self.specialization = specialization
        self.user_type = user_type


class UserSchema(ma.Schema):
    class Meta:
        # Fields to expose
        fields = ('first_name', 'last_name', 'email', 'specialization', 'user_type')

user_schema = UserSchema()
users_schema = UserSchema(many=True)

在我的app.py文件中

from flask import Flask, render_template, request, jsonify
from flask_bootstrap import Bootstrap
from flask_sqlalchemy import SQLAlchemy
from flask_marshmallow import Marshmallow

@APP.route("/patient", methods=["POST"])
def add_appointment():
    first_name = request.json['first_name']
    last_name = request.json['last_name']
    email = request.json['email']
    specialization = request.json['specialization']
    user_type = request.json['user_type']

    new_user = schema.User(first_name, last_name, email, specialization, user_type)

    schema.db.session.add(new_user)
    schema.db.session.commit()

    return jsonify(new_user)

我正在使用覆盆子pi上的虚拟环境运行我的烧瓶应用程序并连接到Google云mysql数据库（如果这有任何差异）。

Answer 1

似乎没有使用棉花糖架构。这可能有用，

schema.db.session.add(new_user)
schema.db.session.commit()

result, errors = schema.user_schema.dump(new_user)

return jsonify(result)