CODEWITHSUNDEEP
javascriptmysqlsequelize.js
margherita pizza
margherita pizza

Reputation: 7185

Self referring foreign key in sequlize js

I have a model employee (id,first_name,last_name,manager_id)

Here the manager_id is a self refering foreign key where it refers to the id column of the same table. How do I implement such a use case in sequelize.

I tried this and this is not working

employee.belongsTo(models.employee, {
        foreignKey: 'manager_id'
      }),

Upvotes: 0

Views: 166

Answers (1)

Vivek Doshi
Vivek Doshi

Reputation: 58593

You can define association like :

employee.belongsTo(employee, {as: "Manager"});
employee.hasMany(employee, { as: "Employee", foreignKey: "manager_id", useJunctionTable: false });

And then use it like 

employee.findAll({
    include : {
        model : employee ,
        as : 'Manager'
    }
})

OR

You can use sequelize-hierarchy

var employee = sequelize.define('employee', {
    name: Sequelize.STRING,
    manager_id: {
        type: Sequelize.INTEGER,
        hierarchy: true
    }
});

employee.findAll({ hierarchy: true }).then(function(results) {
    // results = [
    //  { id: 1, manager_id: null, name: 'a', children: [
    //      { id: 2, manager_id: 1, name: 'ab', children: [
    //          { id: 3, manager_id: 2, name: 'abc' }
    //      ] }
    //  ] }
    // ]
});

Upvotes: 1

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