Return data from pivot table with whereIn - php

Question

So I have Status class which has pivot table relationship with roles:
public function roles():
{
return $this->belongsToMany(Role::class, 'status_role', 'status_id', 'role_id');
}
This is how Status db table looks:
id title
1 status1
2 status2
3 status3
And then my pivot table which looks like this:
status_id role_id
1 2
2 2
And now I want to write query which returns statuses with role_id=2.
Basically it should return data like this: status1, status2 and not include status3.
What I have tryed:
$statuses = Status::query()
->leftJoin('status_role', function ($join) {
$join->on('statuses.id', '=', 'status_role.status_id')
->whereIn('status_role.role_id',[2]);
})
->get();
But now it returns all statuses (status1, status2, status3) it should be only (status1 and status2). How I need to change it?

Answer 1

This query will return all statuses attached to roles with id 2:
Status::query()->whereHas('roles', function($q){
$q->where('id', 2);
})->get();
It uses the whereHas method that can be useful when you need to query relationships.
It can do a lot more, you should check the documentation on this topic: https://laravel.com/docs/8.x/eloquent-relationships#querying-relationship-existence
Quick note: whereHas is the "Laravel preferred way" of doing what you are trying to achieve.
However, you should be able to also do it with this query, which is closer to your current code:
$statuses = Status::query()
->join('status_role', function ($join) {
$join
->on('statuses.id', '=', 'status_role.status_id')
->where('status_role.role_id',2);
})
->get();
// I replaced the leftJoin by join, which will exclude all results without roles (e.g. status id 3)
// or even simpler:
$statuses = Status::query()
->join('status_role', 'statuses.id', '=', 'status_role.status_id')
->where('status_role.role_id',2)
->get();