Laravel 5 eloquent - 将子字段添加到父模型

Question

我有一个用户模型，它有一个名为教师的子关系。如何将相关教师模型中的字段添加到父用户模型返回的数据集中？

我希望返回的用户模型具有如下结构：

用户名

用户名

user.teacher.address

我尝试使用以下及其变体但没有成功：

            $query->select('firstname', 'lastname')
            ->addSelect( \DB::raw('teachers.address AS address') );

user.php 模型：

    use Notifiable;
use SoftDeletes;
use EncryptableTrait;

/**
 * The attributes that are mass assignable.
 *
 * @var array
 */
protected $fillable = [
   'title',
   'firstname',
   'firstname_h',
   'lastname',
   'lastname_h',
   'email',
   'email_h',
   'password',
   'userable_id',
   'userable_type'
];

/**
 * The attributes that are mass encryptable, using the EncryptableTrait.
 *
 * @var array
 */
protected $encryptable = [
    'firstname',
    'lastname',
    'email',
];

/**
 * The attributes that should be hidden for arrays.
 *
 * @var array
 */
protected $hidden = [
    'password', 'remember_token',
];

public function userable()
{
    return $this->morphTo();
}

public function teacher() // Using custom BelongsToMorph relationship type
{
    return BelongsToMorph::build($this, Teacher::class, 'userable');
}

public function roles()
{
    return $this->belongsToMany('App\Role')->withTimestamps();
}

public function schools()
{
    return $this->belongsToMany('App\School')->withPivot('suspended', 'rating');
}

public function thisSchool()
{
    return $this->belongsToMany('App\School')->where('school_id', Auth::user()->userable->id)->withPivot('id', 'suspended', 'rating', 'notes');
}

public function addRole($user, $role_id)
{
    $user->roles()->attach($role_id);
}

public function removeRole($user, $role_id)
{
    $user->roles()->detach($role_id);
}

public function isAdmin($user)
{

    foreach ($user->roles as $role) {

        if($role->id == 4) {

            return true;

        } else {

            $return = false;

        }

    }

    return $return;

}

public function isSchoolAdmin($user)
{

    foreach ($user->roles as $role) {

        if($role->id == 2) {

            return true;

        } else {

            $return = false;

        }

    }

    return $return;

}

public function events()
{
    return $this->belongsToMany('App\Event')->withPivot('cancelled', 'cancelled_by');
}

public function devices()
{
    return $this->hasMany('App\Device');
}

public function teachingstages()
{
    return $this->belongsToMany('App\Teachingstage', 'teacher_teachingstage')->orderBy('teachingstage_id');
}

public function teachingsubjects()
{
    return $this->belongsToMany('App\Teachingsubject', 'teacher_teachingsubject');
}

teacher.php 模型：

    use EncryptableTrait;

protected $table = "teachers";

/**
 * The attributes that are mass assignable.
 *
 * @var array
 */
protected $fillable = [
   'mobile',
   'dob',
   'gender',
   'address',
   'postcode',
   'latitude',
   'longitude',
   'max_distance',
   'public',
   'photo',
   'experience',
   'active',
   'verified',
   'payscale',
   'ta_number',
   'temp_or_perm',
   'locked'
];

/**
 * The attributes that are mass encryptable, using the EncryptableTrait.
 *
 * @var array
 */
protected $encryptable = [
    'mobile',
    'address',
    'postcode',
    'experience',
    'ta_number'
];

public function user()
{
    return $this->morphOne('App\User', 'userable');
}

public function criterias()
{
    return $this->hasMany('App\Criteria');
}

public function bookingrequests()
{
    return $this->belongsToMany('App\Bookingrequest')->withPivot('sent', 'sent_at', 'declined', 'created_at', 'updated_at');
}

public function blacklist()
{
    return $this->hasMany('App\Blacklist');
}

这是我有问题的现有查询：

        $query = User::where('userable_type', 'App\Teacher');

        $query->with('userable');

        $query->select('firstname', 'lastname')
            ->addSelect( \DB::raw('teachers.address AS address') );

        $query->whereDoesntHave('thisSchool');

        $otherTeachers = $query->get();

这是一个现有的应用程序，一切都按预期工作；我的问题更多是关于如何将子模型列作为别名添加到父模型（然后我将使用新的别名列进行计算）。

提前致谢，

K...

Answer 1

好的，最后我自己解决了。

我为我的用户模型添加了一个范围：

    public function scopeJoinWithTeacher($query)
{
    return $query->leftJoin("teachers", "teachers.id", "=", "users.userable_id");
}

然后我在我的查询中实现了这个新范围，并在 get() 中将列从子模型别名到父模型：

    $query = User::where('userable_type', 'App\Teacher');
    $query->with('userable');
    $query->whereDoesntHave('thisSchool');
    $query->JoinWithTeacher();
    $query->orderBy( 'distance', 'ASC' );

    $otherTeachers = $query->get(['teachers.longitude AS longitude', 'teachers.latitude AS latitude', 'users.*']);

我现在拥有从 eloquent 返回的父模型中教师子关系的经度和纬度列。在我的具体情况下，我进一步使用这些别名字段来计算距离并在我的用户模型中创建一个名为距离的新别名。

希望对尝试同样事情的人有所帮助！

K...