铁轨上的红宝石条纹 - 将默认金额设置为购物车小计

Question

我试图将我的购物车连接到条纹，并将金额设置为购物车的订单小计。我尝试在我的订单模型中定义order_subtotal，并尝试通过它来检查我的条纹代码中的金额字段，但是当我检查时出现以下错误：无效整数：order_subtotal

我找不到任何联机解释使用ruby语言连接数量变化的条带。任何帮助将不胜感激，谢谢！

charges_controller.rb

class ChargesController < ApplicationController 
    def new 
    end 

    def create 
     # Amount in cents 
     @amount = :order_subtotal 


     customer = Stripe::Customer.create(
     :email => params[:stripeEmail], 
     :source => params[:stripeToken] 
    ) 

     charge = Stripe::Charge.create(
     :customer => customer.id, 
     :amount  => :order_subtotal, 
     :description => 'Rails Stripe customer', 
     :currency => 'usd' 
    ) 

    rescue Stripe::CardError => e 
     flash[:error] = e.message 
     redirect_to new_charge_path 
    end end 

购物/ show.html.erb

<div class="shopping-cart"> <%= render "shopping_cart" %> <%= form_tag charges_path do %> <article> 
    <% if flash[:error].present? %> 
     <div id="error_explanation"> 
     <p><%= flash[:error] %></p> 
     </div> 
    <% end %> 
    <label class="amount"> 
     <span>:order_subtotal</span> 
    </label> </article> 

    <script src="https://checkout.stripe.com/checkout.js" class="stripe-button" 
      data-key=ENV[PUBLISHABLE_KEY] 
      data-description="Checkout" 
      data-amount= "amount" 
      data-locale="auto" 
      data-shipping-address="null" 
      > </script> 
      <% end %> </div> 

_shopping_cart.html.erb

<% if !@order_item.nil? && @order_item.errors.any? %> 
    <div class="alert alert-danger"> 
    <ul> 
    <% @order_item.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
    <% end %> 
    </ul> 
    </div> 
<% end %> 
<% if @order_items.size == 0 %> 
    <p class="text-center"> 
    There are no items in your shopping cart. Please <%= link_to "go back", root_path %> and add some items to your cart. 
    </p> 
<% else %> 
    <% @order_items.each do |order_item| %> 
    <%= render 'carts/cart_row', product: order_item.product, order_item: order_item, show_total: true %> 
    <% end %> 
    <p class="text-center">Order SubTotal=<%= order_subtotal= @order_items.sum(:total_price)%></p> 

<% end %> 

order.rb

class Order < ActiveRecord::Base 
belongs_to :order_status 
has_many :order_items 
before_create :set_order_status 
before_save :update_subtotal 


def subtotal 
    order_items.collect { |oi| oi.valid? ? (oi.quantity * oi.unit_price) : 0}.sum 
end 
def order_subtotal 
@order_items.sum(:total_price) end end private def set_order_status 
    self.order_status_id = 1 end 

    def update_subtotal 
    self[:subtotal] = subtotal end 

Answer 1

在你charges_controller.rb与

:amount => order_subtotal 

要添加符号，而不是order_subtotal方法的结果的替代

:amount => :order_subtotal 

。

此外，在您的车/ show.html.erb你可能想

<span><%= order_subtotal %></span> 

，而不是

<span>:order_subtotal</span> 

关于这一行：

<p class="text-center">Order SubTotal=<%= order_subtotal= @order_items.sum(:total_price)%></p> 

因为你似乎不当您的购物车正在收费时有一个订单实例，您无法访问Order#order_subtotal方法。因此，最好有一个像cart_subtotal这样的帮助方法来计算显示值，而不是在模板中正确执行。