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If you had to work with Yii2 sure there was a situation when it was necessary to keep communication “many-to-many”.
When it became clear that the network has no behaviors to work with this type of connection, then the correct code was written at the event «after save» and with a warning “works well also” went to the repository.
Personally, I am not satisfied with such a disposition of events. I decided to write something very magical behavior, which is so lacking in the official assembly Yii2.
Installation
Install through the Composer:
php composer.phar require --prefer-dist voskobovich/yii2-many-many-behavior "*"
Or add into composer.json of your project to the section «require»:
"voskobovich/yii2-many-many-behavior": "*"
Execute:
~$ php composer.phar update
Source: yii2-many-many-behavior.
How to use?
Connecting the behavior in the desired model ActiveRecord:
public function behaviors()
{
return [
[
'class' => \voskobovich\behaviors\ManyToManyBehavior::className(),
'users_list' => 'users',
'tasks_list' => [
'tasks',
'get' => function($value) {
return JSON::decode($value);
},
'set' => function($value) {
return JSON::encode($value);
},
]
],
];
}
This example describes two connections:
- Communication «users» will receive and store the primary keys in the properties of the model «users_list».
- Communication «tasks» respectively «tasks_list». At the same time, for a given connection are indicated handlers «set» and «get» which process data before saving the communication and output in the field.
Please note that the properties of «users_list» and «tasks_list» will appear in the model automatically!
Next, add fields in the form of creating/edit:
<?= $form->field($model, 'users_list')
->dropDownList(ArrayHelper::map(User::find()->all(), 's_id', 'name'), ['multiple' => true]) ?>
and allow them to update through mass assignment by adding validation rules:
public function rules()
{
return [
[['users_list', 'tasks_list'], 'safe']
];
}
or you can work with new properties directly:
$model->users_list = [2,5,6,7];
After these manipulations links will be updated automatically.
From the properties of «users_list» and «tasks_list» you can also get an array of primary keys stored on communication models.
print_r($model->users_list);
Returns an array of primary keys stored on the communication «users».
It is worth saying that the formation of a list of primary keys happens only at the moment of the call of reading properties.
Thank you for your attention!
This text is a translation of the article “Сохранение “много ко многим” в Yii2 через поведение” by rafic published on habrahabr.ru.
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