I have a Post model that has a many-many relationship with Tags.
Defined in Post model:
public function getTags(){
return $this->hasMany(Tags::className(), ['id' => 'tag_id'])
->viaTable('post_tags', ['post_id' => 'id']);
}
But Post::tags is read-only. So when I try to set them in the Controller, I get an error:
Invalid Call – yii\base\InvalidCallException
Setting read-only property: app\models\Post::tags
The controller is using load to set all the properties:
public function actionCreate(){
$P = new Post();
if( Yii::$app->request->post() ){
$P->load(Yii::$app->request->post());
$P->save();
return $this->redirect('/posts');
}
return $this->render('create', ['model'=>$P]);
}
The input field in the view:
<?= $form->field($model, 'tags')->textInput(['value'=>$model->stringTags()]) ?>
Why is Post::tags read-only? And whats the proper way to set a model relationship?
Here tags
public function getTags(){
return $this->hasMany(Tags::className(), ['id' => 'tag_id'])
->viaTable('post_tags', ['post_id' => 'id']);
}
is a relation name and returns the object and is not just a attribute or database column.
You cannot use it with textInput() like other attribute for eg email, first_name.
So you are given error of Setting read-only property.
In order to remove this error, you need to create new attrbute or property to model like below
class Post extends \yii\db\ActiveRecordsd
{
public $tg;
public function rules()
{
return [
// ...
['tg', 'string', 'required'],
];
}
// ...
In view file
<?= $form->field($model, 'tg')->textInput(['value'=>$model->stringTags()]) ?>
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