ActiveRecord\BelongsTo::__construct PHP Method

    public function __construct($options = array())
    {
        parent::__construct($options);
        if (!$this->class_name) {
            $this->set_inferred_class_name();
        }
        //infer from class_name
        if (!$this->foreign_key) {
            $this->foreign_key = array(Inflector::instance()->keyify($this->class_name));
        }
    }