node_modules/waterline/test/support/fixtures/integrator/n..m.joins.js

/**
 * Joins
 *
 * @type {Array}
 */
module.exports = [
  {
    alias: 'to',				// the `alias` -- e.g. name of association
    parent: 'message',			// parent/left table name
    parentCollectionIdentity: 'message',
    parentKey: 'id',			// parent PK
    childKey: 'message_id',		// intermediate FK <- parent key
    child: 'message_to_user',	// intermediate/right table name
    childCollectionIdentity: 'message_to_user'
  },
  {
    alias: 'to',
    parent: 'message_to_user',	// intermediate/left table name
    parentCollectionIdentity: 'message_to_user',
    parentKey: 'user_id',		// intermediate FK -> child key
    childKey: 'id',				// child PK
    child: 'user',			// child/right table name
    childCollectionIdentity: 'user'
  }
];