SequelizeEagerLoadingError 'Model 1' is not assoicated to 'Model 2' - node.js

Question

I am using sequelize version:5.21.2, and has the following error: 'Tweet is not associated to User!'
Error: { SequelizeEagerLoadingError: Tweet is not associated to User!
at Function._getIncludedAssociation (D:\References\Youtube\Sequelize\sequelize-1-hour\node_modules\sequelize\lib\model.js:715:13)
at Function._validateIncludedElement (D:\References\Youtube\Sequelize\sequelize-1-hour\node_modules\sequelize\lib\model.js:619:53)
at options.include.options.include.map.include (D:\References\Youtube\Sequelize\sequelize-1-hour\node_modules\sequelize\lib\model.js:516:37)
at Array.map (<anonymous>)
I have two models
Tweet.js
const Sequelize = require('sequelize');
//sequelize comes from global.sequelize in connection.js
const Tweet = sequelize.define('Tweet', {
id: {
type: Sequelize.INTEGER(11),
allowNull: true,
autoIncrement: true,
primaryKey: true
},
userId: Sequelize.INTEGER(11),
content: Sequelize.STRING(300)
});
Tweet.associate = function(models) {
Tweet.belongsTo(models.User, { foreignKey: 'userId' });
};
module.exports = Tweet;
and User.Js
const Sequelize = require('sequelize');
//sequelize comes from global.sequelize in connection.js
const User = sequelize.define('User', {
id: {
type: Sequelize.INTEGER(11),
primaryKey: true
},
username: {
type: Sequelize.STRING(35),
},
passwd: {
type: Sequelize.STRING(20),
allowNull: false
}
});
User.associate = function(models) {
User.hasMany(models.Tweet);
};
module.exports = User;
and the code which throws error is
const users = await User.findAll({
where: { id: '1' },
include: [Tweet]
}).catch(errHandler);
I don't know how to include Tweets when a user is fetched.

Answer 1

You have defined functions, inside your models, that create your associations. However, you never call these functions. After instanciating your Sequelize object and initializing your models, you should run the following code to have your associations created:
for(let modelName in sequelize.models) {
sequelize.models[modelName].associate(sequelize.models);
}
See:
Sequelize models member
Iterating through objects in Javascript