How to remove hasMany id attribute from sequelize join? - postgresql

Question

I am attempting to join two tables defined below in a one-to-many relationship. One Characteristic to many ReviewCharacteristics. Using the following findAll function I am attempting to avg the values in the ReviewCharacteristics table. I have verified the necessary SQL command that should function as expected. Sequelize is including ReviewCharateristic.id in the selected attributes which is causing my grouping to fail.
Is there a way to specify just the avg value and not include the id from the ReviewCharacteristic table in the selected attributes?
exports.Characteristic = db.define('characteristic', {
product_id: {
type: DataTypes.INTEGER,
allowNull: false
},
name: {
type: DataTypes.STRING(7),
allowNull: false
}
}, { underscored: true });
exports.ReviewCharacteristic = db.define('review_characteristic', {
value: {
type: DataTypes.INTEGER,
allowNull: false
}
}, { underscored: true });
exports.Characteristic.hasMany(exports.ReviewCharacteristic, { as: 'rc' });
exports.ReviewCharacteristic.belongsTo(exports.Characteristic);
Characteristic.findAll({
attributes: ['name', 'id'],
where: {
product_id: req.query.product_id
},
group: 'characteristic.id',
include: [{
model: ReviewCharacteristic,
as: 'rc',
attributes: [[Sequelize.fn('AVG', Sequelize.col('rc.value')), 'value']],
required: true
}]
});
I have also tried specifying attributes: ['characteristic.name', 'characteristic.id']
Current:
SELECT
"characteristic"."name",
"characteristic"."id",
"rc"."id" AS "rc.id",
AVG("rc"."value") AS "rc.value"
FROM "characteristic" AS "characteristic"
INNER JOIN "review_characteristic" AS "rc"
ON "characteristic"."id" = "rc"."characteristic_id"
WHERE "characteristic"."product_id" = '18078'
GROUP BY "characteristic"."id";
Expected:
SELECT
"characteristic"."name",
"characteristic"."id",
AVG("rc"."value") AS "rc.value"
FROM "characteristic" AS "characteristic"
INNER JOIN "review_characteristic" AS "rc"
ON "characteristic"."id" = "rc"."characteristic_id"
WHERE "characteristic"."product_id" = '18078'
GROUP BY "characteristic"."id";

Answer 1

If anyone happens to stumble across this question and is dealing with the same issue here is the solution I found.
Characteristic.findAll({
attributes: ['name', 'id', [Sequelize.fn('AVG', Sequelize.col('rc.value')), 'value']],
where: {
product_id: req.query.product_id
},
group: 'characteristic.id',
include: [{
model: ReviewCharacteristic,
as: 'rc',
attributes: [],
required: true
}]
});
The attributes must be specified as an empty array for the joined table in order to stop the addition of the ReviewCharateristic.id attribute in my case.