Sequelize js get count of associated model - sql

Question

Say for example I have a discussions table and replies table.
How do I get the count of replies for each discussion record ?
Models.course_discussions.count({
where: { 'course_id': 105 },
include: [
{model: Models.course_discussions_replies, as: 'replies'}
]
})
.then(function (discussions) {
if (!discussions) {
reply(Hapi.error.notFound());
} else {
console.log("91283901230912830812 " , discussions);
}
});
The above code is converted into the following query -
SELECT COUNT(`course_discussions`.`id`) as `count` FROM `course_discussions` LEFT OUTER JOIN `course_discussions_replies` AS `replies` ON `course_discussions`.`id` = `replies`.`discussion_id` WHERE `course_discussions`.`course_id`=105;
The above code gets me count of discussions. But how do I get the count of the replies for each discussion ?
The following sql query works, but how do I write it in the sequelize way ?
SELECT COUNT( `replies`.`discussion_id` ) AS `count`
FROM `course_discussions`
LEFT OUTER JOIN `course_discussions_replies` AS `replies` ON `course_discussions`.`id` = `replies`.`discussion_id`
WHERE `course_discussions`.`course_id` =105

Answer 1

If you need the discussions and the replies count maybe .replies.length should work for you.
Models.course_discussions.findAll(
where: { 'course_id': 105 },
include: [
{model: Models.course_discussions_replies, as: 'replies'}
]
})
.then(function (discussions) {
// each discussion in discussions will have a
// replies array
discussions[0].repies.length // replies for current discussion
});