yii2简述一对一数据表关联

1、建两个表publish：pub_id 和 images:pub_id,image_path；
2、使用gii的crud生成代码
3、在models内Publish.php内写关联函数

public function getImage()
    {
        return $this->hasOne(Images::className(),['pub_id'=>'pub_id']);
    }

4、在models内publishSearch.php内写joinWith()函数

    public function search($params)
    {
        $query = IhpTPublishInfo::find();
        $query->joinWith(['image']);

        $dataProvider = new ActiveDataProvider([
            'query' => $query,
        ]);

        $this->load($params);

        if (!$this->validate()) {

            return $dataProvider;
        }

        $query->andFilterWhere([
            'pub_id' => $this->pub_id,

        ]);

        return $dataProvider;
    }
}

5、在view内index.php的gradview中调用，$model->image->img_path，其中image对应getImage()函数

    <?= GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $searchModel,
        'columns' => [
            ['class' => 'yii\grid\SerialColumn'],
            'pub_id',
            ['label'=>'缩略图','format'=>'raw','value'=>function($m){
                //var_dump($m->image);
                if(is_object($m->image)){
                    return Html::img($m->image->img_path,['alt' => '缩略图','width' => 80]);
                }
            }],

            ['class' => 'yii\grid\ActionColumn'],

            ['label'=>'添加','format'=>'raw','value'=>function($data){
                $url="http://";
                return Html::a('添加推荐', $url, ['class' => 'btn btn-success']);
            }],

        ],
    ]); ?>