TypeError: Cannot read property 'findAll' of undefined(sequelize)

Question

I did refer to similar questions like this but here while debugging I am getting models as empty. I am clueless as to why is this happening. DB table is Users.

controllers/user.js:

const models = require('../models');
const User = models.Users;
exports.getAllUsers = (req,res,next) => {
  console.log(models);
  console.log(User);
User.findAll({
  attributes: attributesUser
}).then(users => {
  console.log(users);
  res.status(200).json({
    data: users
  });
});
}

models/user.js:

'use strict';
module.exports = (sequelize, DataTypes) => {
  const Users = sequelize.define('Users', {
    firstName: {
      type: DataTypes.STRING,
      allowNull: false,
      validate: {
        len: [4, 255]
      }
    },
    middleName: {
      type: DataTypes.STRING,
      allowNull: false,
      validate: {
        len: [4, 255]
      }
    },
    lastName: {
      type: DataTypes.STRING,
      allowNull: false,
      validate: {
        len: [4,255]
      }
    },
    mobile: {
      type: DataTypes.STRING,
      validate:{
        len: [10,15],
        isNumeric:{
          msg:"Invalid Mobile Number"
        }
      }
    },
    address: {
      type: DataTypes.STRING,
      allowNull:false
    },
    dob: {
      type: DataTypes.DATEONLY,
      allowNull:false
    },
    email: {
      type: DataTypes.STRING,
      allowNull:false,
      unique: true,
      validate: {
        isEmail: true
      },
      set(email){
        this.setDataValue("email",email.toString().toLowerCase());
      }
    },
    password: {
      type: DataTypes.STRING,
      allowNull:false
    },
    gender: {
      type: DataTypes.STRING,
      allowNull:false
    },
    isDisabled: {
      type: DataTypes.BOOLEAN,
      allowNull: false
    },
    lastLoginTime: {
      type: DataTypes.DATE,
    },
    createdAt: {
      type: DataTypes.DATE,
      allowNull:false
    },
    updatedAt: {
      type: DataTypes.DATE,
    },
    deletedAt: {
      type: DataTypes.DATE,
    },
  }, {});
  Users.associate = function(models) {
    // associations can be defined here
    Users.belongsTo(models.UserType, {
      foreignKey: {
        name: "userTypeId",
        allowNull: false
      }
    });
    Users.belongsTo(models.Qualification, {
      foreignKey: {
        name: "qualificationId",
        allowNull: false
      }
    });
    Users.belongsTo(models.Organization, {
      foreignKey: "organizationId",
      allowNull: false
    });
  };
  return Users;
};

Output:

TypeError: Cannot read property 'findAll' of undefined
    at exports.getAllUsers (/mnt/part1/projects/Video_Coaching/backend-v2/controllers/user.js:87:10)
    at Layer.handle [as handle_request] (/mnt/part1/projects/Video_Coaching/backend-v2/node_modules/express/lib/router/layer.js:95:5)
    at next (/mnt/part1/projects/Video_Coaching/backend-v2/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/mnt/part1/projects/Video_Coaching/backend-v2/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/mnt/part1/projects/Video_Coaching/backend-v2/node_modules/express/lib/router/layer.js:95:5)
    at /mnt/part1/projects/Video_Coaching/backend-v2/node_modules/express/lib/router/index.js:281:22

Answer 1

The problem was the models didn't had sequelize instance.

While sequelize created a index.js file under models/ but I commented that file at the start of the project because it gave me errors. I just un-commented the file and created models like this const models = require('../models/index');.

So one should require models/index.js to get sequelize and DataTypes instance where one is going to use models, not models/user.js.