TypeScript Sequelize : How to join two tables with common - sql

Question

There are three tables.
Tables :
Trip
id | start_destination_id | end_destination_id | arrive_time |
-------------------------------------------------------------------
1 | S | E | 09:00 |
Destination
id | name
---------
S | Start
E | End
Schedule
id | start_destination_id | end_destination_id | should_arrive |
-------------------------------------------------------------------
1 | S | E | 08:00 |
2 | A | E | 10:00 |
Query
SELECT
Trip.*,
Schedule.should_arrive
FROM
Trip
LEFT JOIN
Schedule
ON
Trip.start_destination_id = Schedule.start_destination_id
AND
Trip.end_destination_id = Schedule.end_destination_id
I am trying to include Schedule in Trip.findAll but receive error
Exception: SequelizeEagerLoadingError: Schedule is not associated to Trip!
Is there a way that I can join them together without using foreign keys and raw queries?
Many thanks.

Answer 1

Finally I found a solution (not sure if it is a hack).
Schedule.ts
// add these lines
...
#ForeignKey(() => Trip)
#Column({ type: DataType.VIRTUAL })
private _dummyForTrip: undefined;
...
Then create an association between Schedule and Trip.
Trip.ts
#HasMany(() => Schedule)
public schedules: Schedule[] | null
Then you can include Schedule inside Trip by using include.on
const trips = await Trip.findAll({
include: [{
model: Schedule,
on: {
'$schedules.start$': { [Op.col]: "Trip.start_destination" },
'$schedules.end$': { [Op.col]: "Trip.end_destination" },
}
}],
where: {
id: { [Op.in]: payload.inputTripIdArr }
}
});