Yii2，ActiveQuery搜索模型（如果存在关系模型）

Question

There are 2 Active Record models Questions( Q ) and Answers( A ).

For simplicity I omit unsignificant attributes:

• Q : question_id
• A : answer_id, question_id

Q hasMany A , link by question_id

public function getAnswers()
{
    return $this->hasMany(Answer::className(), ['question_id' => 'question_id']);
}

How can I create find query for finding only Q models, which have at least one related A model?

This query require in ActiveDataProvider in basic Q Search model.

Answer 1

使用innerJoinWith （ doc ）：

Q::find()->innerJoinWith(['answers'])->all();