Simple usage example of related query in Yii2

The example in this article describes the usage of associated query in Yii2. Share it with everyone for your reference, the details are as follows:

There are two tables, post and category, post.cate_id corresponds to category.id

Use Gii to increase the models of these two tables

Then the post model has the following code

public function getCate()
{
  return $this->hasOne(Category::className(), ['id' => 'cate_id']);
}

Add the following method at the bottom of the post model to obtain the content of the association table

public static function getPostsByCategory($cate_id)
{
  return Post::find()
    ->joinWith('cate')
    ->where(['post.cate_id'=>$cate_id])
    ->asArray()
    ->all();
}

I hope this article will be helpful to everyone’s PHP program design based on the Yii framework.

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