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How to create/update a model with its related items using Listbox or CheckboxList
Revision #12 was created by 
fixed typo in a sample code
Yii version
2.0
Content
[...]
### PostWithCategories modelAnd the last one is extended from Post. It has an additional attribute called 'category_ids' that will be used to handle the categories of the post. Note that **'category_ids' attribute is an array** of category ids.
```php
class PostWithCategories extends Post
{
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We want to add a small utility method to Category model.```php
class Category extends ActiveRecord
{
[...]
{$categories = self::find()->order('name')->asArray()->all();
$items = ArrayHelper::map($categor
return $items;
}
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### Create action```php
/**
* Create Post with its categories
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In the view script, we can use a listBox with multiple selection or a checkboxList to select the categories.```php
<?php $form = ActiveForm::begin([
'id' => 'post-form',
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It's almost the same with Create action:```php
/**
* Update a post with its categories
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It's different from create.php only in the text of the submit button: ```php
...
<?= Html::submitButton('Update', [
'class' => 'btn btn-primary'
]) ?>
...
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