How to join two tables and get values in Yii2 grid

问题:

I'm using Yii2 gridview widget to display the data.

I'm using two tables named as message and message_trigger.

In message table columns are object_model, Object_id.

In message_trigger the column are object_id, object_name.

The grid get the values from the table message. So grid fields are Object_model, Object_id.

Now my problem is I need to show Object_name from the table message_trigger based on the object_id from the table message.

In my form I have used grid like this

<?= GridView::widget([
    'dataProvider' => $dataProvider,
    'filterModel' => $searchModel,
    'columns' => [
        ['class' => 'yii\grid\SerialColumn'],
        'object_model',
        'object_id',
        ['class' => 'yii\grid\ActionColumn', 'template' => '{view} {update} {delete} '],
    ],
]); ?>

In model I have used

public function search($params){
    $query = AlertTrigger::find()->where(['alert_id'=>$params['id']])->andWhere(['!=','status',2]);
    $dataProvider = new ActiveDataProvider([
        'query' => $query,
    ]);
}

回答1:

In Message Model

public function getMessageTrigger()
{
    return $this->hasOne(MessageTrigger::className(), ['object_id' => 'object_id']);
}

in view

<?= GridView::widget([
    'dataProvider' => $dataProvider,
    'filterModel' => $searchModel,
    'columns' => [
        ['class' => 'yii\grid\SerialColumn'],
        'object_model',
        'object_id',
        [
            'label' => 'Name',
            'value' => 'messageTrigger.object_name',
        ],
        ['class' => 'yii\grid\ActionColumn', 'template' => '{view} {update} {delete} '],
    ],
]); ?>

回答2:

ankitraturi answer is the best answer. If anybody want to get value using a function from the model and use it in the gridview means follow the below steps.

1. Add the function which returning the value in the a model(Here I use Message Model).

public static function get_message_trigger($id){
    $model = MessageTrigger::find()->where(["object_id" => $id])->one();
    if(!empty($model)){
        return $model->object_name;
    }

    return null;
}

2. In the Gridview use like below.

<?= GridView::widget([
    'dataProvider' => $dataProvider,
    'filterModel' => $searchModel,
    'columns' => [
        ['class' => 'yii\grid\SerialColumn'],
        'object_model',
        'object_id',
        [
            'label' => 'Name',
            'value' => function($data){
                return Message::get_message_trigger($data->object_id)
            },
        ],
        ['class' => 'yii\grid\ActionColumn', 'template' => '{view} {update} {delete} '],
    ],
]); ?>

Hope this will help someone.