保存后编辑不保存选择选项

Question

保存表单后，一旦我返回编辑，就不会保存我的选择选项。 我有两个模型PDA_Kategorije和PDA_Potkategorije。

class PDAPotkategorije extends Model

{ 使用CrudTrait;

/*
|--------------------------------------------------------------------------
| GLOBAL VARIABLES
|--------------------------------------------------------------------------
*/

protected $table = 'pda_potkategorije';
// protected $primaryKey = 'id';
// public $timestamps = false;
protected $guarded = ['id'];
protected $fillable = ['name', 'pdakategorija_id'];
// protected $hidden = [];
// protected $dates = [];



/*
|--------------------------------------------------------------------------
| FUNCTIONS
|--------------------------------------------------------------------------
*/

/*
|--------------------------------------------------------------------------
| RELATIONS
|--------------------------------------------------------------------------
*/

public function pda_kategorije()
{
    return $this->hasOne('App\Models\PDAKategorije', 'id', 'pdakategorija_id');
}

PDAKategorije类扩展模型 { 使用CrudTrait;

/*
|--------------------------------------------------------------------------
| GLOBAL VARIABLES
|--------------------------------------------------------------------------
*/

protected $table = 'pda_kategorije';
// protected $primaryKey = 'id';
// public $timestamps = false;
protected $guarded = ['id'];
protected $fillable = ['name'];
// protected $hidden = [];
// protected $dates = [];

/*
|--------------------------------------------------------------------------
| FUNCTIONS
|--------------------------------------------------------------------------
*/

/*
|--------------------------------------------------------------------------
| RELATIONS
|--------------------------------------------------------------------------
*/

public function pda_potkategorije()
{
    return $this->belongsTo('App\Models\PDAPotkategorije', 'pdakategorija_id', 'id');
}

在PDAPotkategorijeCrudController中，我有

        $this->crud->addField([
        'name' => 'name',
        'type' => 'text',
    ]);

    $this->crud->addField([
        'label' => "Odaberite kategoriju",
        'type' => 'select',
        'name' => 'pdakategorija_id', // the relationship name in your Model
        'entity' => 'pda_kategorije', // the relationship name in your Model
        'attribute' => 'name', // attribute on Article that is shown to admin
        'model' => "App\Models\PDAKategorije", //
    ]);

在setupListOperation中，将pda_potkategorije正确分配给pda_kategorije https://imgur.com/hA7rXO8

但是，一旦我单击“编辑”，pda_kategorije的选择选项就不会保存。