How to generate query on join table using Sequelize? - sql

Question

Let us say there are two tables namely User and User Role.
The relationship between user and user role is one to many.
Sequelize model for the user is as following -
const user = sequelize.define(
'user', {
id: {
type: DataTypes.BIGINT,
allowNull: false,
primaryKey: true,
autoIncrement: true,
field: 'id'
},
userName: {
type: DataTypes.STRING(200),
allowNull: false,
field: 'username'
},
password: {
type: DataTypes.STRING(200),
allowNull: false,
field: 'password'
}
}, {
tableName: 'user'
}
);
Sequelize model for user role is as follwing -
const userRole = sequelize.define(
'userRole', {
id: {
type: DataTypes.BIGINT,
allowNull: false,
primaryKey: true,
autoIncrement: true,
field: 'id'
},
userId: {
type: DataTypes.BIGINT,
allowNull: false,
primaryKey: true,
autoIncrement: true,
field: 'user_id'
},
password: {
type: DataTypes.STRING(200),
allowNull: false,
field: 'password'
}
}, {
tableName: 'userRole'
}
);
Sequelize association is defined as follows -
user.hasMany(models.userRole, { foreignKey: 'user_id', as: 'roles' });
userRole.belongsTo(models.user, { foreignKey: 'user_id', as: 'user' });
I want to generate the following query using
Sequelize -
SELECT *
FROM USER
INNER JOIN (SELECT user_role.user_id,
role
FROM user_role
INNER JOIN USER tu
ON tu.id = user_role.user_id
GROUP BY user_id
ORDER BY role) AS roles
ON USER.id = roles.user_id;
I am developing an API which will be consumed by the front end grid for showing user info. There is search functionality on role attribute of user role table. If any of role of a specific user is matched then I expect a user record with all the roles which are associated with that user.

Answer 1

To get all roles that are associated with the user even if one of them matches with a query you need to define another association so that you can include role table twice in sequelize statement.
User.hasMany(models.UserRole, { foreignKey: 'user_id', as: 'roles2' });
Sequelize statement -
const userInfo = await User.findAndCountAll({
include: [
{
model: UserRole,
attributes: ['id', 'role'],
as: 'roles',
where: { [Op.or]: [{ role: { [Op.like]: '%MANAGER%' } },
required: true
},
{
model: UserRole,
attributes: ['id', 'role'],
as: 'roles2',
required: true
}
],
where: whereStatement,
});
With the help of first include (join), you can filter user records based on user role and with the help of the second include(join), you can get all the roles of a user whose one of the roles is matched.

Answer 2

You have to use include (regarding the doc : https://sequelize.org/master/manual/models-usage.html#-code-findandcountall--code----search-for-multiple-elements-in-the-database--returns-both-data-and-total-count)
Exemple :
Models.User.findAll({
where :{
id: userId
},
group: ['roles.user_id'],
order: [['roles.role', 'ASC']] //or DESC, as you want
include: {
model: Models.UserRole,
as: 'roles',
attributes: ['user_id', 'role'],
required: true
},
})
Hope it helps you