increase items in shopping cart using rails and redis -

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i having trouble increasing quantity of items in cart. add one, switches 'remove' button. there way can reconfigure can add more 1 of each item?

carts_controller.rb

def add   $redis.sadd current_user_cart, params[:item_id]   render json: current_user.cart_count, status: 200 end

carts.coffee

$(window).load ->   $('a[data-target]').click (e) ->     e.preventdefault()     $this = $(this)     if $this.data('target') == 'add to'       url = $this.data('addurl')       new_target = "remove from"     else       url = $this.data('removeurl')       new_target = "add to"     $.ajax url: url, type: 'put', success: (data) ->       $('.cart-count').html(data)       $this.find('span').html(new_target)       $this.data('target', new_target)     $('#mycart .remove').click (e) ->     e.preventdefault()     $this = $(this).closest('a')     url = $this.data('targeturl')     $.ajax url: url, type: 'put', success: (data) ->       $('.cart-count').html(data)       $this.closest('.cart-item').slideup()

i figured out on own. items being saved array, more 1 can added cart. 'add to' button no longer toggling , forth between 'add to' , 'remove from'. 'remove' button separate. 

  def show    cart_ids = $redis.lrange current_user_cart, -100, 100    @cart_items = item.find(cart_ids)   end   def add   $redis.lpush current_user_cart, params[:item_id]   render json: current_user.cart_count, status: 200  end   def remove   $redis.lrem current_user_cart, 1, params[:item_id]   render json: current_user.cart_count, status: 200  end

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