在yii2中，选择2如果该选项不存在，如何在数据库中添加值 - in yii2 select2 how to add value in database if that option does not exists

in yii2 select2 how to add value in database if that option does not exists

如果yii2 select2中不存在，如何在数据库中添加类别。

<?= 
    $form->field($model, 'question_category')->widget(Select2::classname(), [
        'data' => ArrayHelper::map(Category::find()->all(),'category_name','category_name'),
        'maintainOrder' => true,
        'toggleAllSettings' => [
            'selectLabel' => '<i class="glyphicon glyphicon-ok-circle"></i> Tag All',
            'unselectLabel' => '<i class="glyphicon glyphicon-remove-circle"></i> Untag All',
            'selectOptions' => ['class' => 'text-success'],
            'unselectOptions' => ['class' => 'text-danger'],
        ],
        'options' => ['multiple' => true, 'placeholder' => 'Select a Category ...'],
        'pluginOptions' => [
            'tags' => true,
            'maximumInputLength' => 10
        ],
    ]);
?>

为Category创建一个模型类。以下代码将帮助您创建模型。

<?php
namespace app'models;
use Yii;
class Category extends 'yii'db'ActiveRecord
{
    
    public static function tableName()
    {
        return 'category';
    }
    
    public function rules()
    {
        return [
            [['category_code', 'category_name'], 'required'],
        ];
    }
   
 
    public static function find()
    {
        return new CategoryQuery(get_called_class());
    }
    
    
}