fix some problems

app/Input.php

@@ -7,18 +7,22 @@ use Illuminate\Database\Eloquent\Model;
 class Input extends Model
 {
     public $fillable = ['name','type','size','test_type_id','parent_id','require_scanner'];
+
     public function test_type()
     {
         return $this->belongsTo('App\TestType');
     }
+
     public function parent()
     {
         return $this->belongsTo('App\Input', 'parent_id');
     }
+
     public function children()
     {
         return $this->hasMany('App\Input', 'parent_id');
     }
+
     public function options()
     {
         return $this->hasMany('App\Option');