rocodev-tech

  <ul class="nav navbar-nav navbar-right">
 
        <li> 
          <%= link_to "#" do  %>
            購物車 <i class="glyphicon glyphicon-shopping-cart"> </i> (0)
          <% end %>
        </li>
 
        <% if !current_user %>
        <li> <%= link_to("登入", new_user_session_path) %> </li>

rocodev-tech

     <div> 數量 : <%= render_product_quantity(@product) %> </div>
     <div class="product-price"> $ <%= render_product_price(@product) %> </div>

     <div class="pull-right">
      <%= link_to("加入購物車", add_to_cart_product_path(@product) , :method => :post , :class => "btn btn-primary btn-lg btn-danger") %>
     </div>
     

rocodev-tech

  resources :products do 
    member do 
      post :add_to_cart
    end
  end

rocodev-tech

  def add_to_cart

    @product = Product.find(params[:id])

    if !current_cart.items.include?(@product)
      current_cart.add_product_to_cart(@product)
      flash[:notice] = "你已成功將 #{@product.title} 加入購物車"
    else
      flash[:warning] = "你的購物車內已有此物品"
    end

rocodev-tech

  helper_method :current_cart

  def current_cart
    @current_cart ||= find_cart
  end

  def find_cart

    cart = Cart.find_by(id: session[:cart_id])

rocodev-tech

class Cart < ActiveRecord::Base
  
  has_many :cart_items, :dependent => :destroy
  has_many :items, :through => :cart_items, :source => :product


  def add_product_to_cart(product)
    items << product
  end

rocodev-tech

class CartItem < ActiveRecord::Base
  
  belongs_to :cart
  belongs_to :product


end

rocodev-tech

 <div class="row">
   <div class="col-md-12">

    <h2> 購物車 </h2>

    <table class="table table-bordered">
      <thead>
        <tr>
          <th>商品資訊</th>
          <th></th>

rocodev-tech

 <div class="row">
   <div class="col-md-12">

    <h2> 購物明細 </h2>

    <table class="table table-bordered">
      <thead>
        <tr>
          <th width="80%">商品明細</th>
          <th>單價</th>

rocodev-tech

class CartsController < ApplicationController
  
  before_action :authenticate_user!, :only => [:checkout]

  def index
  end

  def checkout
    @order = current_user.orders.build
    @info = @order.build_info