php - Laravel Eloquent: How to order results of related models?

Question

I have a model called School and it has many Students .

Here is the code in my model:

public function students()
{
    return $this->hasMany('Student');
}

I am getting all the students with this code in my controller:

$school = School::find($schoolId);

and in the view:

@foreach ($school->students as $student)

Now I want to order the Students by some field in the students table. How can I do that?

Answer 1

You have a few ways of achieving this:

// when eager loading
$school = School::with(['students' => function ($q) {
  $q->orderBy('whateverField', 'asc/desc');
}])->find($schoolId);

// when lazy loading
$school = School::find($schoolId);
$school->load(['students' => function ($q) {
  $q->orderBy('whateverField', 'asc/desc');
}]);

// or on the collection
$school = School::find($schoolId);
// asc
$school->students->sortBy('whateverProperty');
// desc
$school->students->sortByDesc('whateverProperty');


// or querying students directly
$students = Student::whereHas('school', function ($q) use ($schoolId) {
  $q->where('id', $schoolId);
})->orderBy('whateverField')->get();