How do I define a composite unique constraint using a association's foreign key?

How do I define a composite unique constraint using a association’s foreign key?

From the docs, I have:

To get full control over the foreign key column added by sequelize, you can use the foreignKey option. It can either be a string, that specifies the name, or and object type definition,
equivalent to those passed to sequelize.define.

My model definition:

module.exports = function(sequelize, DataTypes) {
  var SelectedItem = sequelize.define('SelectedItem', {
    name: {
      type: DataTypes.STRING,
      allowNull: false
    },
    externalId: {
      type: DataTypes.STRING,
      allowNull: false,
      unique: 'uniqueSelectedItem'
    },
    source: {
      type: DataTypes.ENUM('GOOGLE', 'YAHOO'),
      allowNull: false,
      unique: 'uniqueSelectedItem'
    }
  }, {
    paranoid: true,
    classMethods: {
      associate: function(models) {
        SelectedItem.belongsTo(models.Item, {
          foreignKey: {
            name: 'itemId',
            unique: 'uniqueSelectedItem'
          }
        });
      }
    }
  });

  return SelectedItem;
};

From the above definition, I have a composite unique constraint on fields externalId, source and itemId (foreign key for my SelectedItem.belongsTo(models.Item) relationship).

But here are the queries executed:

DROP TABLE IF EXISTS "SelectedItems" CASCADE;
DROP TYPE IF EXISTS "enum_SelectedItems_source";
SELECT t.typname enum_name, array_agg(e.enumlabel) enum_value FROM pg_type t JOIN pg_enum e ON t.oid = e.enumtypid JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace WHERE n.nspname = 'public'  AND t.typname='enum_SelectedItems_source'  GROUP BY 1
DROP TYPE IF EXISTS "enum_SelectedItems_source"; CREATE TYPE "enum_SelectedItems_source" AS ENUM('GOOGLE', 'YAHOO');
CREATE TABLE IF NOT EXISTS "SelectedItems" ("id"   SERIAL , "name" VARCHAR(255) NOT NULL, "externalId" VARCHAR(255) NOT NULL, "source" "enum_SelectedItems_source" NOT NULL, "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL, "updatedAt" TIMESTAMP WITH TIME ZONE NOT NULL, "deletedAt" TIMESTAMP WITH TIME ZONE, "itemId" INTEGER REFERENCES "Items" ("id") ON DELETE CASCADE ON UPDATE CASCADE, UNIQUE ("externalId", "source"), PRIMARY KEY ("id"));

Am I doing something wrong?

[janmeier]

As a temp. solution you could add the itemId could to the model, and in the association do: SelectedItem.belongsTo(models.Item, { foreignKey: SelectedItem.rawAttributes.itemIt });

[janmeier]

@OKNoah Please provide a SSCCE