public function initManyToManyRelations()
    {
        if ($this->isManyToMany()) {
            $fk1 = $this->foreignKeys[0];
            $fk2 = $this->foreignKeys[1];
            $this->injectManyToMany($fk1, $fk2);
            $this->injectManyToMany($fk2, $fk1);
        }

        return $this;
    }