Yii2: Why in the beforeDelete method, does the hasMany return a null? -

i'm trying delete related data has many-to-many relationship

my complex model:

/**  * @return \yii\db\activequery  */ public function getcomplexdocument() {     return $this->hasmany(complexdocument::classname(), ['complex_id' => 'id']); }  /**  * @return \yii\db\activequery  */ public function getdocuments() {     return $this->hasmany(documents::classname(), ['id' => 'document_id'])         ->via('complexdocument'); } 

in beforedelete following:

public function beforedelete() {             foreach ($this->documents $document){         var_dump($document);     }     return parent::beforedelete(); } 

deletion not happen, checked , hasmany connections return null.

in debug see following

i did way:

public function delete() {     foreach ($this->documents $document){         $document->delete();     }     return parent::delete(); // todo: change autogenerated stub } 

everything works, related documents deleted, seems strange me. in fact, should in beforedelete (), why not links returned , therefore not deleted, should be, or shortage of framework?