Sequelize N-M association doesn't recognize the include model - mysql

Question

I am trying to do a many-to-many assocition with sequelize but I constantly having the same error without reason...
Here is the error I get : SequelizeEagerLoadingError: User is not associated to UserTool!
I searched on the web and my code is corresponding to many right answers that I found.
The M-M association goes like this : User-UserTool-Tool, UserTool is the bridge table between User and Tool
Here is the following code :
Model User - User.js
const Sequelize = require('sequelize');
var db = require('../../config/database');
const User = db.define('User', {
id: {
type: Sequelize.INTEGER
},
name: {
type: Sequelize.STRING
},
}, {
timestamps: false,
freezeTableName: true,
tableName: 'User'
});
module.exports = User;
Model Tool - Tool.js
const Sequelize = require('sequelize');
var db = require('../../config/database');
const Tool = db.define('Tool', {
id: {
type: Sequelize.INTEGER
},
name: {
type: Sequelize.STRING
},
}, {
timestamps: false,
freezeTableName: true,
tableName: 'Tool'
});
module.exports = Tool;
Model UserTool - UserTool.js
const Sequelize = require('sequelize');
var db = require('../../config/database');
const UserTool = db.define('UserTool', {
userId: {
type: Sequelize.INTEGER
},
toolId: {
type: Sequelize.INTEGER
},
status: {
type: Sequelize.STRING
},
active: {
type: Sequelize.STRING
},
}, {
timestamps: false,
freezeTableName: true,
tableName: 'UserTool'
});
module.exports = UserTool;
Main.js
const Sequelize = require('sequelize');
var db = require('../../config/database');
const User = require('./User');
const Tool = require('./Tool');
const UserTool = require('./UserTool');
User.belongsToMany(Tool, { through: UserTool });
Tool.belongsToMany(User, { through: UserTool });
module.exports = {
User,
Tool,
UserTool
}
And then when I try to do a findAll() with an include, I get the error mentionned previously.
Here is the code of the findAll with the include
Find.js
const {User, UserTool} = require('./Main');
exports.FindAllUsers = async function (params) {
let message;
await UserTool.findAll({
where: {
userId: params.userId
},
include: [
{
model: User
},
]
});

Answer 1

As I understand it, if you want to query all users. Simply use the following method:
const result = await User.findAll();
If you want to query the user with id = 1 and all tools for that user, using:
const result = await User.findAll({
where: { id: '1' },
include: [{ model: Tool }],
});
sequelize will query the appropriate Tools for User based on the join table UserTool. Eager loading needs both sides(User and Tool) of the model are established associations(belongsToMany). UserTool doesn't establish associations with User, so you can't use include options, that's why sequelize throw that error.