带Redis的Rails购物车：存储项目数量

Question

I'd like to store a product's quantity along with its ID using Redis. Here's what I have right now:

  def add
    $redis.sadd current_user_cart, params[:product_id]
    redirect_to carts_show_path(current_user_cart)
    render json: current_user.cart_count, status: 200
  end

How can I store more than one value in a single key? Do I need to use a hash?

Answer 1

Yes. Redis is a key/value store. Meaning that it only has 2 columns... One is the key and the second one is the value, which I would in your case define as a JSON over a hash.