....
public function getUser() {
return $this->hasOne(User::className(), ['id' => 'author_id']);
}
public function getLikes() {
return $this->hasMany(PostLikes::className(), ['like_id' => 'post_id']);
}
public function getPost() {
return $this->hasOne(Posts::className(), ['post_id' => 'like_id']);
}