Sequelize double relationships - node.js

Question

I'm doing a node.js project that allows virtual trading between user.
A User can have many trades. Each Trade will have to contain 2 fk from User, which are the id of the seller as well as the buyer.
I'm using sequelize in node.js to build up the model.
const { Sequelize, DataTypes, Model } = require('sequelize');
import {sequelize} from '../database/connection.js';
const User = sequelize.define('User', {
// Model attributes are defined here
id:{
type: DataTypes.INTEGER(11),
allowNull: false,
autoIncrement: true,
primaryKey: true
},
}, {
// Other model options go here
sequelize, // We need to pass the connection instance
freezeTableName: true
});
module.exports = User
///////////////////////////////////////////
// Trade
const { Sequelize, DataTypes, Model } = require('sequelize');
import {sequelize} from '../database/connection.js';
const Trade = sequelize.define('Trade', {
// Model attributes are defined here
id:{
type: DataTypes.INTEGER(11),
allowNull: false,
autoIncrement: true,
primaryKey: true
},
isPaid:{
type: DataTypes.BOOLEAN,
defaultValue: true
}
// fk are in relationships.js
}, {
// Other model options go here
sequelize, // We need to pass the connection instance
freezeTableName: true
});
module.exports = Trade
/////////////////////////////////////
//relationships
User.hasMany(Trade,{
foreignKey: "offererId"
})
Trade.belongsTo(User);
//
User.hasMany(Trade,{
foreignKey: "receiverId"
})
Trade.belongsTo(User);
Is this a right solution?

Answer 1

Using a super M:N may be your most versatile option.
User.belongsToMany(User, { through: Trade, as: "offerer", foreignKey: "offererId"})
User.belongsToMany(User, { through: Trade, as: "receiver", foreignKey: "receiverId"})
Trade.belongsTo(User)
User.hasMany(Trade)
This allows you to use the auto-generated association methods and query user on user.