添加 RoleId 和 UserId 会导致：TypeError：无法读取未定义的属性（读取“创建”）

Question

我尝试在 User_Roles 表中添加 roleId 和 userId，但创建后显示错误：

TypeError: Cannot read properties of undefined (reading 'create')

这是 UserRoles.js 的模块文件：

module.exports = (sequelize, DataTypes) => {

    const UserRoles = sequelize.define("User_Roles");

    return UserRoles;
}

这是 UserRoles.js 的路由器文件：

const express = require("express");
const router = express.Router();
const UserRoles = require("../models").UserRoles;

router.post("/", async (req, res) => {
    const { RoleId, UserId } = req.body;
    const usrRoles = await UserRoles.create({ RoleId: RoleId, UserId: UserId });
    res.json(usrRoles);
});

module.exports = router;

在我有添加角色ID和用户ID的操作的页面上：

axios.post("http://localhost:3001/userRoles", { RoleId: parseInt(value, 10), UserId: selectedUserIdEdit }).then((response) => {
    console.log('response', response);
})

console.log 显示：RoleId: 1，UserId: 1，这是正确的，但它没有存储它。

Answer 1

确保在 Sequelize 模型文件中正确定义并导出 UserRoles 模型。模型文件应如下所示：

module.exports = (sequelize, DataTypes) => {
    const UserRoles = sequelize.define("UserRoles", {
        RoleId: {
            type: DataTypes.INTEGER,
            allowNull: false,
        },
        UserId: {
            type: DataTypes.INTEGER,
            allowNull: false,
        },
    }, {
        // Additional model options (optional)
        tableName: 'User_Roles', // Specify table name if it's not     automatically inferred
        timestamps: false, // Disable timestamps if not needed
    });

    return UserRoles;
};

检查UserRoles模型是否在models/index.js文件中正确导入和导出，通常如下所示：

const { Sequelize, DataTypes } = require('sequelize');
const sequelize = new Sequelize(process.env.DATABASE_URL); // Adjust based on your config

    const db = {};
    
    db.UserRoles = require('./UserRoles')(sequelize, DataTypes);
    // Import other models as needed
    // db.OtherModel = require('./OtherModel')(sequelize, DataTypes);
    
    db.sequelize = sequelize;
    db.Sequelize = Sequelize;
    
    module.exports = db;