rocodev-tech

class CreateOrderItems < ActiveRecord::Migration
  def change
    create_table :order_items do |t|
      t.string :product_name
      t.float :price
      t.integer :quantity
      t.integer :order_id
      t.timestamps
    end
  end

rocodev-tech

class CreateOrderInfos < ActiveRecord::Migration
  def change
    create_table :order_infos do |t|
      t.integer :order_id
      t.string :billing_name
      t.string :billing_address

      t.string :shipping_name
      t.string :shipping_address
      t.timestamps

rocodev-tech

class CreateOrders < ActiveRecord::Migration
  def change
    create_table :orders do |t|
      t.integer :user_id
      t.integer :total
      t.boolean :paid, :default => false
      t.timestamps
    end
  end
end

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

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

 <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

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


end

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

  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

  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