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问题描述
我有一个名为School的模型，它有很多学生.
I have a model called School and it has many Students .
这是我模型中的代码:
public function students()
{
return $this->hasMany('Student');
}
我正在让所有学生在我的控制器中使用此代码:
I am getting all the students with this code in my controller:
$school = School::find($schoolId);
在视图中:
@foreach ($school->students as $student)
现在我想按 students 表中的某个字段对 Students 进行排序.我该怎么做?
Now I want to order the Students by some field in the students table. How can I do that?
推荐答案
你有几种方法可以实现:
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();
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