类型错误：无法读取未定义的属性（读取“findAll”）

Question

I am getting TypeError: Cannot read properties of undefined (reading 'findAll') error and I couldn't find why. Here is my index.js and User.js files in models folder;

index.js;

'use strict';

const fs = require('fs');
const path = require('path');
const Sequelize = require('sequelize');
const basename = path.basename(__filename);
const config = require('../../config/database.js');

const db = {};

const sequelize = new Sequelize(config);

fs
  .readdirSync(__dirname)
  .filter(file => {
    return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
  })
  .forEach(file => {
    const model = sequelize['import'](path.join(__dirname, file));
    db[model.hostname] = model;
    db[model.username] = model;
    db[model.password] = model;
    db[model.command] = model;
    db[model.status] = model;
    db[model.cpu] = model;
    db[model.mac] = model;
    db[model.info] = model;
  });

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

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

module.exports = db;

User.js;

'use strict';
module.exports = (sequelize, DataTypes) => {
  const User = sequelize.define('User', {
    /* id : DataTypes.INTEGER, */
    hostname: DataTypes.STRING,
    username: DataTypes.STRING,
    password: DataTypes.STRING,
    command: DataTypes.STRING,
    status: DataTypes.STRING,
    cpu: DataTypes.INTEGER,
    mac: DataTypes.STRING,
    info: DataTypes.STRING
  }, {});
  User.associate = function(models) {
    // associations can be defined here
  };
  return User;
};

And here is my controller UserController.js file;

const { User } = require('../models');

module.exports = {

    index(req, res) {
        User.findAll({})
            .then(users => res.json({
                error: false,
                data: users
            }))
            .catch(error => res.json({
                error:true,
                data: [],
                error: error
            }));
    },

    create(req, res) {
        const { /* id, */hostname,username,password,command,status,cpu,mac,info} = req.body;
        User.create({
            /* id, */hostname,username,password,command,status,cpu,mac,info
        })
        .then(user => res.status(201).json({
            error: false,
            data: user,
            message: "new user has been created"
        }))
        .catch(error => res.json({
            error:true,
            data: [],
            error: error
        }));
    },

    update(req, res) {
        const user_id = req.params.id;

        const { hostname,username,password,command,status,cpu,mac,info } = req.body;

        User.update({
            hostname,username,password,command,status,cpu,mac,info
        }, {
            where: {
                id: user_id
            }
        })
        .then(user => res.status(201).json({
            error: false,
            data: user,
            message: 'user has been updated'
        }))
        .catch(error => res.json({
            error: true,
            error: error
        }));
    },

    destroy(req, res) {
        const user_id = req.params.id;

        User.destroy({ where: {
            id: user_id
        }})
        .then(status => res.status(201).json({
            error: false,
            message: 'user has been deleted'
        }))
        .catch(error => res.json({
            error: true,
            error: error
        }));
    }
}

I couldn't figure out what caused this problem. I'd be glad if you could help.Here is my project directory;

directory

Answer 1

You're passing an empty object to User.findAll({}) in your UserController.js file.

Try User.findAll() , instead.

Answer 2

I had the same problem just last night, and it was happening to me because I was calling findAll() before I synced sequelize sequelize.sync() . That is why it is returning undefined. Not sure if it happening to you for the same reason because you haven't attached the code for your server.js. Also either pass in an attribute prop inside the findAll({}) or get rid of the curly braces.