findAll sequelize with model returning odd values - node.js

Question

Solved thanks to : https://stackoverflow.com/a/64702949/14585149
I am looking to list all transactions I have on a mysql database with the associated users.
I have 2 tables / models : Transaction & User
Transaction :
module.exports = function(sequelize, DataTypes) {
return sequelize.define('transactions', {
transaction_id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true
},
user_id: {
type: DataTypes.INTEGER(11),
allowNull: false,
references: {
model: 'users',
key: 'user_id'
}
},
account_id: {
type: DataTypes.INTEGER(11),
allowNull: false,
references: {
model: 'accounts',
key: 'account_id'
}
},
}, { tableName: 'transactions' }); };
User :
module.exports = function(sequelize, DataTypes) {
return sequelize.define('users', {
user_id: {
type: DataTypes.INTEGER(11),
allowNull: false,
primaryKey: true,
references: {
model: 'recipients',
key: 'created_by'
}
},
contact_id: {
type: DataTypes.INTEGER(11),
allowNull: true,
references: {
model: 'contacts',
key: 'contact_id'
}
}, }, {
tableName: 'users',
timestamps: false
});
};
I have made the associations :
Transaction.hasOne(User, {foreignKey:'user_id'});
User.belongsTo(Transaction, {foreignKey:'user_id'});
and my code is :
api.get('/trx', async (req, res) => {
Transaction.findAll({
attributes: ['transaction_id','user_id','account_id'],
include: [{
model: User,
attributes: ['user_id']}]
})
.then(intrx => res.json(intrx))
.catch(res.catch_error)
});
the result :
[
{
"transaction_id": 1,
"user_id": 4,
"account_id": 1,
"user": {
"user_id": 1
}
},
{
"transaction_id": 2,
"user_id": 4,
"account_id": 75,
"user": {
"user_id": 2
}
}
]
why the values of user_id are different ?
I am expecting the user_id = 4 instead of 1 in my first result and user_id = 4 in my second result.
what I am doing wrong ?

Answer 1

You should reverse your associations like this:
Transaction.belongsTo(User, {foreignKey:'user_id'});
User.hasOne(Transaction, {foreignKey:'user_id'});
because Transaction has link to User i.e. belongs to it.