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getting this error after building the ts files yield User.create({ ^ TypeError: Cannot read properties of undefined (reading 'create')(在生成ts文件后获得此错误将产生User.create({^TypeError：无法读取未定义的属性(正在读取‘Create’)))

转载 作者：bug小助手 更新时间：2023-10-24 18:10:45 35 4
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I am getting this error after running npm run build yield User.create({
^

在运行NPM Run Build Year User.create({^


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

TypeError：无法读取undefined的属性（正在读取"“）


models/index.ts

模型/索引.ts


'use strict';

const fs = require('fs');
const path = require('path');
const Sequelize = require('sequelize');
//const process = require('process');
const basename = path.basename(__filename);
const env = process.env.NODE_ENV || 'development';
const config = require(__dirname + '/./config/config.js')[env];
const db: any = {};

console.log(config)

let sequelize: any;
if (config.use_env_variable) {
  console.log(1)

  sequelize = new Sequelize(process.env[config.use_env_variable], config);
} else {
  console.log(2)

  sequelize = new Sequelize('***', {
    dialect: 'postgres',
    dialectoptions: {
        ssl: true
    }
});

  console.log(sequelize)
}

fs
  .readdirSync(__dirname)
  .filter((file: string) => {
    return (
      file.indexOf('.') !== 0 &&
      file !== basename &&
      file.slice(-3) === '.ts' &&
      file.indexOf('.test.js') === -1
    );
  })
  .forEach((file: any) => {
    const model = require(path.join(__dirname, file))(sequelize, Sequelize.DataTypes);
    db[model.name] = model;
  });

Object.keys(db).forEach(modelName => {
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});

db.sequelize = sequelize;
db.Sequelize = Sequelize;

export default db;

models/user.ts

Models/user.ts


'use strict';
import {
  Model, UUIDV4
} from 'sequelize';

interface UserAttributes {
  id: number;
  first_name: string;
  last_name: string;
}

module.exports = (sequelize: any, DataTypes: any) => {
  class User extends Model<UserAttributes> implements UserAttributes {
    /**
     * Helper method for defining associations.
     * This method is not a part of Sequelize lifecycle.
     * The `models/index` file will call this method automatically.
     */
    id!: number;
    first_name!: string;
    last_name!: string;
    static associate(models: any) {
      // define association here
    }
  }
  User.init({
    id: {
      type: DataTypes.UUID,
      defaultValue: UUIDV4,
      allowNull: false,
      primaryKey: true
    },
    first_name: DataTypes.STRING,
    last_name: DataTypes.STRING
  }, {
    sequelize,
    modelName: 'User',
  });
  return User;
};


index.ts

Index.ts


import express, { Application, Request, Response, NextFunction} from 'express';

const app: Application = express();

const calc = (a: number, b: number) => {
    return a + b;
}

import db from './models';

db.sequelize.sync().
then(function() {
  console.log('DB connection sucessful.');
}).catch((err: any)=> console.log('error has occured'));

db.User.create({
  first_name: "lola",
  last_name: "lola"
})


/* app.get('/', (req: Request, res: Response) => {
    console.log(calc(2,5))
    res.send('Hello122');
})

app.get('/hi', (req: Request, res: Response) => {
    console.log(calc(2,5))
    res.send('Hello122');
}) */

app.listen(5000, () => console.log('Server is running'));

I have tried importing the db in the index files with different methods but did not work. Any solution will be welcomed. Thank you

我曾尝试用不同的方法导入索引文件中的数据库，但不起作用。任何解决方案都将受到欢迎。谢谢


更多回答

Are you sure each model has a name property? I can't find anything in the Sequelize docs referring to such a thing (but maybe I'm just bad at searching). Try adding some simple debugging? console.log("registering model", model.name)

您确定每个型号都有名称属性吗？我在续集文档中找不到任何提到这种事情的东西(但也许我只是搜索不好)。尝试添加一些简单的调试？Console.log(“注册模型”，Model.name)

Or better output db to console prior to calling db.User.create

或者更好的做法是在调用db.User.create之前将数据库输出到控制台

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