Laravel枢轴列过滤

Question

My codes:

$course   = Course::find(1);
$teachers = $course->Users()->where('role_id', 1)->get();
$students = $course->Users()->where('role_id', 2)->get();

In this solution, I have two different user types. Users() function is a belongsToMany relationship.

public function Users()
{
    return $this->belongsToMany(User::class, 'course_users')->withPivot('role_id');
}

And my course_users table columns: user_id, course_id, role_id

This codes running properly.

But, when I looked to queries, I saw two SQL queries for this situation. I want to use only one query and get only filtered values to suitable variables for performance. How can I do it?

I tried below code. But it only fetches first variable $teachers, but not $students.

$users    = $course->Users();
$teachers = $users->where('role_id', 1)->get();
$students = $users->where('role_id', 2)->get();

What is your opinions? Thank you.

Answer 1

If having just one query is important, you can load the data like this:

$users = $course->Users()->whereIn('role_id', [1, 2])->get();

And then use the collection to filter data:

$teachers = $users->where('role_id', 1);
$students = $users->where('role_id', 2);

Answer 2

Thanks. I solved like this.

$users = $course->Users()->whereIn('role_id', [1, 2])->get();
$teachers = $users->where('pivot.role_id', 1);
$students = $users->where('pivot.role_id', 2);