Sequelize, foreign keys as composite primary key

Question

it is possible to define two foreign keys as a composite primary key of a model?

A user can only be a member of one family, a family can have many members and the fa

Answer 1

For anyone looking to create a composite index primary key based of the columns(keys) in your join table when doing migrations. You will need to add a primary key constraint for the two columns that you wish to act as the combined primary key for the table.

module.exports = {
  up: function (queryInterface, Sequelize) {
    return queryInterface.createTable('itemtags', {
      itemId: {
        type: Sequelize.INTEGER,
        references: {
          model: 'items',
          key: 'id',
        },
        onDelete: 'CASCADE',
        onUpdate: 'CASCADE',
        allowNull: false
      },
      tagId: {
        type: Sequelize.INTEGER,
        references: {
          model: 'tags',
          key: 'id',
        },
        onDelete: 'CASCADE',
        onUpdate: 'CASCADE',
        allowNull: false
      }
    })
      .then(() => {
        return queryInterface.addConstraint('itemtags', ['itemId', 'tagId'], {
          type: 'primary key',
          name: 'gametag_pkey'
        });
      });
  },
  down: function (queryInterface, Sequelize) {
    return queryInterface.dropTable('gametags');
  }
};

Which is roughly the same as doing ALTER TABLE ONLY my_table ADD CONSTRAINT pk_my_table PRIMARY KEY(column1,column2); in postgres.