Laravel获取类别和子类别

Question

表结构

--------------------------
|id     name    parent_id
--------------------------
|1      Memory  NULL
|2      RAM     1

对于我的模型的特征和子特征，如下所示

class Feature extends Model
{
    public $fillable = ['name','parent_id'];


    public function parent()
    {
        return $this->belongsTo('App\Feature','parent_id');
    }

    public function child()
    {
        return $this->hasMany('App\Feature','parent_id');
    }
}

现在，我想获取父级功能和子功能，

Answer 1

尝试这个 ：

$f = Feature::with('child', 'parent')->get()

现在，您可以像这样：

$f->name;
$f->parent->name;
$f->child->name;

Answer 2

$features = Feature::whereNull('parent_id')->with('child')->get();

然后

foreach ($features as $feature)
{
    $feature->name; // Parent
    $feature->child->name; // Child
}