Question

这是我的模型结构：

class Family extends Model
{
    public function members()
    {
        return $this->hasMany('App\Person');
    }   
}

class Person extends Model
{
    public function family()
    {
        return $this->belongsTo('App\Family');
    }

    public function school()
    {
        return $this->belongsTo('App\School');
    }
}

class School extends Model
{
    public function students()
    {
        return $this->hasMany('App\Person');
    }
}

简而言之，Person属于许多Schools，但只有一个Family。

虚拟数据：

families_table

id | name
---------
1  | Smith
2  | Doe

people_table

id | family_id | school_id | name
----------------------------------
1  | 1         | 1         | Betty
2  | 2         | 1         | John

school_table

id | name
-------------
1  | MIT

因此我们需要用户：Smith, Betty和Doe, John。现在，如果我这样做：

$school = School::find(1);

foreach ($school->students AS $student) {
    echo $student->family->name . ', ' . $student->name
}

我会得到：

Smith, Betty
Doe, John

我想看到的是：

Doe, John
Smith, Betty

如何获取School并列出members表格中name字段排序的Family？

Answer 1

最简单的方法是对集合进行排序：

$school->students->load('family');
$school->students->sortBy(function ($item) {
    return $item->family->name;
});

您还可以使用如下的连接对查询中的结果进行排序：

$students = $school->students()
    ->with('family')
    ->select('students.*')
    ->join('families', 'families.id' , '=', 'students.family_id')
    ->orderBy('families.name')
    ->get();
$school->setRelation('students', $students);

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