private function mergeRelationships(array $toAdd)
    {
        $this->relationships = array_merge($this->relationships, $toAdd);
        ksort($this->relationships);
        return $this;
    }
private function mergeRelationships(array $toAdd)
    {
        $this->relationships = array_merge($this->relationships, $toAdd);
        ksort($this->relationships);
        return $this;
    }
private function mergeRelationships ( array $ toAdd ) { $ this -> relationships = array_merge ( $ this -> relationships , $ toAdd ) ; ksort ( $ this -> relationships ) ; return $ this ; }
Merges relationships with this instance's relationships.

@param   array   $toAdd
@return  self
Merges relationships with this instance s relationships .