Sequelize query with two JOINs on custom fields - node.js

Question

Currently I've got a solution with the following raw query, which works well.
Here's a SqlFiddle playground.
And here's the raw query that works well:
const sql = `SELECT u.*, g.name AS "gender"
FROM users u
INNER JOIN connections con ON con.user_id = u.id
INNER JOIN completed_quizzes q ON q.user_id = u.id
LEFT JOIN genders g ON g.id = u.gender_id
WHERE
con.other_user_id='foo'
AND q.quiz_id=1
AND con.status='approved'
AND u.deleted_at IS NULL
AND con.deleted_at IS NULL
AND q.deleted_at IS NULL
LIMIT 10
OFFSET 0
`;
But I'm trying to replace it with Sequelize's object modelling. So far, the most meaningful solution I've come up with this:
const sequelize = {
include: [
{
model: ConnectionsModel,
as: 'connections',
where: { otherUserId: userId, status: ConnectionStatus.approved },
required: true,
duplicating: false
},
{
model: CompletedQuizzesModel,
as: 'completedQuizzes',
where: { userId, quizId },
required: true,
duplicating: false
},
{
model: GendersModel
}
],
nest: true,
// have to specify `raw: false`, otherwise Sequelize returns only the first associated record
raw: false
};
It generates the following query (I've prettified it, for ease of reading):
SELECT u.*, g.name AS gender FROM users AS u
INNER JOIN connections AS con ON u.id = con.user_id AND (con.status = 'approved' AND con.other_user_id = 'foo')
INNER JOIN completed_quizzes AS q ON u.id = q.user_id AND (q.user_id = 'foo' AND q.quiz_id = '1')
LEFT OUTER JOIN genders AS g ON u.gender_id = g.id
WHERE u.deleted_at IS NULL
LIMIT 20
OFFSET 0;
But it returns nothing... no rows. Whereas, the original solution returns the rows as needed.
I can see the difference between the general where (which is applied to the whole query in the raw query) and the same attributes appended to the on clause in the joins. Not sure if that's the problem, though.
Here's the SqlFiddle playground again.

Answer 1

You added an extra condition in the include option CompletedQuizzesModel. In the original SQL query you don't have a condition on userId.
So this include should be like this:
{
model: CompletedQuizzesModel,
as: 'completedQuizzes',
where: { quizId }, // removed userId
required: true,
duplicating: false
}
The result query works just like the original one:
SELECT u.*, g.name AS gender FROM users AS u
INNER JOIN connections AS con ON u.id = con.user_id AND (con.status = 'approved' AND con.other_user_id = 'foo')
INNER JOIN completed_quizzes AS q ON u.id = q.user_id AND (q.quiz_id = '1')
LEFT OUTER JOIN genders AS g ON u.gender_id = g.id
WHERE u.deleted_at IS NULL
LIMIT 20
OFFSET 0;