add new column in sequelize migration code example

Example 1: sequelize migration add column foreign key

queryInterface.addConstraint('table_name', {
  fields: ['column_name'],
  type: 'foreign key',
  name: 'custom_fkey_constraint_name', // optional
  references: {
    table: 'target_table_name',
    field: 'target_column_name'
  },
  onDelete: 'cascade',
  onUpdate: 'cascade'
});

Example 2: sequelize migration add column

module.exports = {
    up: (queryInterface, Sequelize) => {
        return queryInterface.sequelize.transaction((t) => {
            return Promise.all([
                queryInterface.addColumn('table_name', 'field_one_name', {
                    type: Sequelize.STRING
                }, { transaction: t }),
                queryInterface.addColumn('table_name', 'field_two_name', {
                    type: Sequelize.STRING,
                }, { transaction: t })
            ])
        })
    },

    down: (queryInterface, Sequelize) => {
        return queryInterface.sequelize.transaction((t) => {
            return Promise.all([
                queryInterface.removeColumn('table_name', 'field_one_name', { transaction: t }),
                queryInterface.removeColumn('table_name', 'field_two_name', { transaction: t })
            ])
        })
    }
};