From: Soichi Ishida <lists@...>
Date: 2012-04-21T10:15:30+09:00
Subject: What does '||=' mean?

Well, as stated in the subject, what does '||=' mean?

It's from

  def current_cart
    if session[:cart_id]
      @current_cart ||= Cart.find(session[:cart_id])  #HERE!!!
      session[:cart_id] = nil if @current_cart.purchased_at
    end
    if session[:cart_id].nil?
      @current_cart = Cart.create!
      session[:cart_id] = @current_cart.id
    end
    @current_cart
  end

Is this Rails issue? I thought it's some Ruby grammar thing, because I
know there is an expression, '|='.

Thanks in advance.


soichi

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