How to define unique index on multiple columns in sequelize

Question

How do I define a unique index on a combination of columns in sequelize. For example I want to add a unique index on user_id, count and name.

var Tag = sequ         


        

Answer 1

Sequelize composite unique (manual)

module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.createTable('Model', {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: Sequelize.INTEGER
      },
      fieldOne: {
        type: Sequelize.INTEGER,
        unique: 'uniqueTag',
        allowNull: false,
        references: {
          model: 'Model1',
          key: 'id'
        },
        onUpdate: 'cascade',
        onDelete: 'cascade'
      },
      fieldsTwo: {
        type: Sequelize.INTEGER,
        unique: 'uniqueTag',
        allowNull: false,
        references: {
          model: 'Model2',
          key: 'id'
        },
        onUpdate: 'cascade',
        onDelete: 'cascade'
      },
      createdAt: {
        allowNull: false,
        type: Sequelize.DATE
      },
      updatedAt: {
        allowNull: false,
        type: Sequelize.DATE
      }
    })
    .then(function() {
      return queryInterface.sequelize.query(
        'ALTER TABLE `UserFriends` ADD UNIQUE `unique_index`(`fieldOne`, `fieldTwo`)'
      );
    });
  },
  down: (queryInterface, Sequelize) => {
    return queryInterface.dropTable('Model');
  }
};