我是 Rails 的新手，我不知道这里发生了什么。我正在构建的应用程序是一个在线商店。当前功能有效，但我尝试实现的更改无效。作为起点，我将展示我现在拥有的工作版本。这是我的 carts/show.html.erb 文件:
<p id="notice"><%= notice %></p>
<h2>My Cart</h2>
<table class="table table-responsive table-striped">
<thead>
<tr>
<th>Item</th>
<th>Quantity</th>
<th>Total Price in Galleons</th>
<th>Total Price in Muggle Currency</th>
</tr>
<tbody>
<%= render(@cart.line_items) %>
<tr>
<td>Total</td>
<td><%= number_to_currency(@cart.total_price * 7.35) %></td>
<td></td>
<td></td>
</tr>
</tbody>
</thead>
</table>
<br>
<div class="row">
<div class="col-md-3">
<div class="row">
<div class="col-md-4">
<%= link_to 'Back', products_path, :class => 'btn btn-primary whiteText' %>
</div>
<div class="col-md-4">
<%= link_to "Checkout", new_charge_path, :class => 'btn btn-success whiteText' %>
</div>
<div class="col-md-4">
<%= link_to 'Empty Cart', @cart, method: :delete, data: {confirm: 'Are you sure you want to empty your cart?'}, :class => 'btn btn-danger whiteText' %>
</div>
</div>
</div>
<div class="col-md-9"></div>
</div>
但是，我想稍微更改一下工作流程，以便在单击购物车显示页面上的“结帐”后，它使用我的订单脚手架将用户重定向到地址确认页面 (orders/new.html.erb)。确认地址后，它应该将客户引导至付款页面，这是我当前结帐链接中的 new_charge_path 已经重定向到的页面。
所以首先，我要替换 Checkout 链接并将其转换为:
<%= link_to "Checkout", new_charge_path, :class => 'btn btn-success whiteText' %>
为此:
<%= link_to "Checkout", new_order_path, method: :get, :class => 'btn btn-success whiteText' %>
此重定向按预期运行，并将我带到 orders/new.html.erb，其中包含以下内容:
<h1>Order Information</h1>
<br>
<%= render 'form', order: @order %>
<%= link_to 'Back', products_path %>
它呈现的表单包含以下代码:
<%= form_for(order) do |f| %>
<% if order.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(order.errors.count, "error") %> prohibited this order from being saved:</h2>
<ul>
<% order.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="row">
<div class="col-md-6">
<div class="field">
<%= f.label :first_name %>
<%= f.text_field :first_name, size: 20, :value => current_user.first_name, :class => "form-control" %>
</div>
<div class="field">
<%= f.label :last_name %>
<%= f.text_field :last_name, size: 20, :value => current_user.last_name, :class => "form-control" %>
</div>
<div class="field">
<%= f.label :address %>
<%= f.text_area :address, size: 40, :value => current_user.address, :class => "form-control" %>
</div>
<div class="field">
<%= f.label :city %>
<%= f.text_area :city, size: 20, :value => current_user.city, :class => "form-control" %>
</div>
<div class="field">
<%= f.label :state %>
<%= f.text_area :state, size: 2, :value => current_user.state, :class => "form-control" %>
</div>
<div class="field">
<%= f.label :email %>
<%= f.text_field :email, size: 40, :value => current_user.email, :class => "form-control" %>
</div>
<div class="field">
<%= f.label :pay_type %>
<%= f.select :pay_type, Order.pay_types.keys, prompt: 'Select a payment method', :class => "form-control" %>
</div>
</div>
<div class="col-md-6">
<%= form_tag(payments_path, class: "form-inline") do %>
<%= hidden_field_tag(:purchase_amount_cents, @cart.total_price) %>
<div class="form_group">
<%= label_tag(:credit_card_number, "Credit Card Number", class: "sr-only") %>
<%= text_field_tag(:credit_card_number, "", class: "form-control", placeholder: "Credit Card #") %>
</div>
<br>
<div class="form_group">
<%= label_tag(:expiration_month, "Month", class: "sr-only") %>
<%= text_field_tag(:expiration_month, "", class: "form-control", placeholder: "Month") %>
<br>
<%= label_tag(:expiration_year, "Year", class: "sr-only") %>
<%= text_field_tag(:expiration_year, "", class: "form-control", placeholder: "Year") %>
<br>
<%= label_tag(:cvc, "Year", class: "sr-only") %>
<%= text_field_tag(:cvc, "", class: "form-control", placeholder: "CVC #") %>
</div>
<br>
<div class="form_group">
<%= submit_tag("Purchase Cart", class: "btn btn-default", id: "purchase") %>
</div>
<% end %>
</div>
</div>
<hr>
<div class="actions">
<%= f.submit 'Proceed to Payment' %>
</div>
<% end %>
付款选项为信用卡 (Stripe) 或 Paypal。我最终会添加 Paypal 功能，但 Stripe API 是我现在所拥有的。
这是我的订单 Controller :
class OrdersController < ApplicationController
include CurrentCart
before_action :set_cart, only: [:new, :create]
before_action :ensure_cart_isnt_empty, only: :new
before_action :set_order, only: [:show, :edit, :update, :destroy]
# GET /orders
# GET /orders.json
def index
@orders = Order.all
end
# GET /orders/1
# GET /orders/1.json
def show
end
# GET /orders/new
def new
@order = Order.new
end
# GET /orders/1/edit
def edit
end
# POST /orders
# POST /orders.json
def create
@order = Order.new(order_params)
@order.add_line_items_from_cart(@cart)
respond_to do |format|
if @order.save
format.html { redirect_to new_charge_path}
else
format.html { render :new }
format.json { render json: @order.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /orders/1
# PATCH/PUT /orders/1.json
def update
respond_to do |format|
if @order.update(order_params)
format.html { redirect_to @order, notice: 'Order was successfully updated.' }
format.json { render :show, status: :ok, location: @order }
else
format.html { render :edit }
format.json { render json: @order.errors, status: :unprocessable_entity }
end
end
end
# DELETE /orders/1
# DELETE /orders/1.json
def destroy
@order.destroy
respond_to do |format|
format.html { redirect_to orders_url, notice: 'Order was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_order
@order = Order.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def order_params
params.require(:order).permit(:first_name, :last_name, :address, :city, :state, :email, :pay_type)
end
def ensure_cart_isnt_empty
if @cart.line_items.empty?
redirect_to products_path, notice: 'Your cart is empty!'
end
end
end
这是我的充电 Controller :
class ChargesController < ApplicationController
include CurrentCart
before_action :set_cart, only: [:new, :create]
def new
end
def create #METHOD IS CALLED AFTER PAYMENT IS MADE
# Amount in cents
@amount = @cart.total_price
customer = Stripe::Customer.create(
:email => params[:stripeEmail],
:source => params[:stripeToken]
)
charge = Stripe::Charge.create(
:customer => customer.id,
:amount => @amount,
:description => 'Customer',
:currency => 'usd'
)
Cart.destroy(session[:cart_id])
rescue Stripe::CardError => e
flash[:error] = e.message
redirect_to new_charge_path
end
end
问题来了。虽然重定向按预期工作，但如果使用订单 Controller ，收费 Controller 中的@amount 将设置为 $0.00。但是，如果 Cart 直接链接到 Charge Controller ，则会使用正确的金额。因此，我假设购物车对象以某种方式丢失或重置其值。
这是我的 set_cart 方法:
def set_cart
@cart = Cart.find(params[:id])
end
这是我的 CurrentCart 模块:
module CurrentCart
private
def set_cart
@cart = Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
@cart = Cart.create
session[:cart_id] = @cart.id
end
end
最佳答案
我的想法是您需要将值@cart.total_price 从购物车显示表单传递给订单 Controller ，这里有一些步骤要做
在您的链接中(您将值作为参数传递)
<%= link_to "Checkout", new_order_path(total_price: @cart.total_price), method: :get, :class => 'btn btn-success whiteText' %>
在 order_controller 内部(你得到参数并放入实例变量)
# GET /orders/new
def new
@order = Order.new
@temp_total_price = params[:total_price]
end
在 order_form 中插入你的 form_for 标签，我们需要把它作为隐藏值放在表单中，这样它就可以传递给 create 方法进行收费
<%= hidden_field_tag 'total_price', @temp_total_price %>
在你的类 ChargesController create 方法中你可以获得 total_price
@total_price = params[:total_price]
我知道这有点日志，但这可能会有所帮助
关于ruby-on-rails - Rails 应用程序中的参数可能缺少值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45106794/