我正在开发一个非常基本的购物车,我遇到的问题是,如果我将多个相同的产品添加到我的购物车中,我看不到数量增加,而是只看到该项目的多个版本。
例如我看到:
1 x绿灯= 15英镑 1 x绿灯= 15英镑
而不是看到:
2 x绿灯=£30
如何制作,以便购物车检查购物车中的多个版本,然后将它们一起添加?
目前我有:
应用程序控制器
def current_cart
if session[:cart_id]
@current_cart ||= Cart.find(session[:cart_id])
end
if session[:cart_id].nil?
@current_cart = Cart.create!
session[:cart_id] = @current_cart.id
end
@current_cart
end
购物车控制器
def show
@cart = current_cart
end
购物车型号
has_many :items
def total_price
items.to_a.sum(&:full_price)
end
购物车视图
<table id="line_items">
<tr>
<th>Product</th>
<th>Qty</th>
<th class="price">Unit Price</th>
<th class="price">Full Price</th>
</tr>
<% for item in @cart.items %>
<tr class="<%= cycle :odd, :even %>">
<td><%=h item.product.name %></td>
<td class="qty"><%= item.quantity %></td>
<td class="price"><%= gbp(item.unit_price) %></td>
<td class="price"><%= gbp(item.full_price) %></td>
</tr>
<% end %>
<tr>
<td class="total price" colspan="4">
Total: <%= gbp(@cart.total_price) %>
</td>
</tr>
</table>
更多信息
产品#索引
<%= link_to "Add to Cart", line_items_path(:product_id => product), :method => :post %>
人们可以提供的任何建议都将非常感激。谢谢!
新设置 - 导致错误Uninitialised Constant CartController
的routes.rb
Checkout::Application.routes.draw do
ActiveAdmin.routes(self)
devise_for :admin_users, ActiveAdmin::Devise.config
post '/add_to_cart/:product_id' => 'cart#add_to_cart', :as => 'add_to_cart'
resources :carts
resources :products
resources :items
root :to => 'products#index'
end
推车控制器
class CartsController < ApplicationController
def show
@cart = current_cart
end
def add_to_cart
current_cart.add_item(params[:product_id])
redirect_to carts_path(current_cart.id)
end
end
购物车型号
class Cart < ActiveRecord::Base
has_many :items
def add_item(product_id)
item = items.where('product_id = ?', product_id).first
if item
# increase the quantity of product in cart
item.quantity + 1
save
else
# product does not exist in cart
product = Product.find(product_id)
items << product
end
save
end
def total_price
items.to_a.sum(&:full_price)
end
end
产品#索引
<table class="jobs">
<thead>
<tr>
<th scope="col" id="name">Product Code</th>
<th scope="col" id="company">Name</th>
<th scope="col" id="company">Price</th>
<th scope="col" id="company">Action</th>
</tr>
</thead>
<tbody>
<% @product.each do |product| %>
<tr>
<td><%= product.product_code %></td>
<td><%= product.name %></td>
<td><%= gbp(product.price) %></td>
<td><%= button_to "Add to Cart", add_to_cart_path(:product_id => product), :method => :post %></td>
</tr>
<% end %>
</tbody>
</table>
答案 0 :(得分:9)
在购物车模型中,创建一个名为
的方法def add_item(product_id)
item = items.where('product_id = ?', product_id).first
if item
# increase the quantity of product in cart
item.quantity + 1
save
else
# product does not exist in cart
cart.items << Item.new(product_id: product_id, quantity: 1)
end
save
end
在routes.rb中,
post '/add_to_cart/:product_id' => 'cart#add_to_cart', :as => 'add_to_cart'
将您的添加到购物车路线更改为推车控制器中的调用add_to_cart方法。
def add_to_cart
current_cart.add_item(params[:product_id])
# redirect to shopping cart or whereever
end
这可以让你了解你想要完成的任务。