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 teacher 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：

user.firstname

user.lastname

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 型号：

    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 型号：

    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');
}

这是我遇到问题的现有查询：

        $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，一切正常；我的问题更多是关于如何添加一个子模型列作为父模型的别名（然后我将使用新的别名列来计算一些东西）。

提前致谢，

K...

Answer 1

好的，最后我自己解决了这个问题。

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() 中从子模型到父模型对列进行了别名：

    $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.*']);

我现在从 eloquent 返回的父模型中有来自师生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 distance 的新别名。

希望对尝试同样事情的人有所帮助！

K...

Laravel 5 eloquent - 将子字段添加到父模型

Laravel 5 eloquent - add child field to parent model

php

sql

eloquent

laravel-5

laravel-eloquent