how do you exclude the primary key column in a join operation on a MySQL database

[jasonmng]

given the following query

model.findAll({
  attributes: [
    [Sequelize.fn('sum', Sequelize.col('price')), 'totalPrice'],
  ],
  include: {
    model: otherModel
    attributes: ['userId'],
    where: {
      userId: 1
    }
  }
  group: ['otherModel.userId']
});

where otherModel.id is the primary key on that table, it outputs a query that looks like

SELECT
  sum(`price`) AS`totalPrice`,
  `OtherModel`.`id` AS `OtherModel.id`,
  `OtherModel`.`userId` AS `OtherModel.userId`
  ...

which is giving me a SELECT list is not in GROUP BY clause and contains nonaggregated column error. How can I make it so that OtherModel.id AS OtherModel.id does not get generated?