Detailed explanation of Yii2.0 scenarios scenario application

Yii2.0 scenario usage:

For a simple example, there are three fields: title, image, content in the post table. When I create a post, I want all three fields It is a required field, but when you modify it, the two fields of title content are required, and iamge does not need to be filled in. Under normal circumstances, [['title', 'content', 'image'], 'required',], but when we change it, we only need [['title', 'content'], 'required'], just OK, but without the image field, our form cannot be submitted. What should we do about this problem? ?

Scenarios can help you solve this problem. The following is a simple scenario example.

1. First, we define the scene class name in the model and it must be scenarios()

public function scenarios()
{
return [
'create' => ['title', 'image', 'content'],
'update' => ['title', 'content'],
];
}

2. Okay, as shown above, we have completed part of the basic setting of the scene. Next we set rules(), and when calling the scene, we use the on keyword

[['title', 'content'], 'required', 'on' => ['create', 'update']],
[['image'], 'required', 'on' => 'create'],
[['image'], 'image', 'enableClientValidation' => true, 'maxSize' => 1024, 'message' => '您上传的文件过大', 'on' => ['create', 'update']],

on 指定的就是场景，一个场景用字符串，多个场景用数组

3. Okay, we have set up the model. Now let’s call it.

$model = $this->findModel($id);
$model->setScenario('update'); 
//或者 $model->scenario = 'update'; 都可以

in the Controller. The above means Call the update scenario. Everything is that simple

The above is the detailed explanation of Yii2.0 scenarios scenario application. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!