Add function User Management, cart, orders with specific user

app/controllers/application_controller.rb

@@ -5,16 +5,20 @@ class ApplicationController < ActionController::Base
 
   rescue_from ActiveRecord::RecordNotFound, :with => :record_not_found
 
-  def current_cart
-    Cart.find(session[:cart_id])
-  rescue ActiveRecord::RecordNotFound
-    cart = Cart.create
-    session[:cart_id] = cart.id
-    cart
-  end
+  include ApplicationHelper
 
   private
 
+    def after_sign_in_path_for(resource_or_scope)
+      if current_user
+        current_user.add_line_items_from_cart(current_cart)
+        current_user.save
+        current_cart.destroy unless current_user.cart == current_cart
+      end
+      session[:cart_id] = current_user.cart.id
+      super
+    end
+
     def record_not_found
       flash[:danger] = 'Record Not found.'
       redirect_to root_path

app/controllers/carts_controller.rb

 class CartsController < ApplicationController
 
   def show
+    flash.now[:warning] = 'Cart is empty.' unless current_cart.line_items.any?
   end
 
   def destroy

app/controllers/orders_controller.rb

 class OrdersController < ApplicationController
+  before_action :authenticate_user!
   before_action :set_order, only: [:show, :edit, :update, :destroy]
 
   def index
-    @orders = Order.page(params[:page])
+    @orders = current_user.orders.page(params[:page])
+    flash.now[:warning] = 'You have not order item yet.' unless @orders.any?
   end
 
   def show
@@ -20,7 +22,6 @@ class OrdersController < ApplicationController
   def create
     @order = Order.new(order_params)
     @order.add_line_items_from_cart(current_cart)
-
     if @order.save
       current_cart.destroy
       session[:cart_id] = nil

app/helpers/application_helper.rb

@@ -11,7 +11,12 @@ module ApplicationHelper
   def current_cart
     Cart.find(session[:cart_id])
   rescue ActiveRecord::RecordNotFound
+    if current_user
+      current_user.cart = Cart.create
+      cart = current_user.cart
+    else
       cart = Cart.create
+    end
     session[:cart_id] = cart.id
     cart
   end

app/models/cart.rb

 class Cart < ActiveRecord::Base
   has_many :line_items, :dependent => :destroy
+  belongs_to :user
 
   def add_product(product_id)
     current_item = line_items.where(product_id: product_id).first
@@ -14,6 +15,16 @@ class Cart < ActiveRecord::Base
     current_item
   end
 
+  def combine_item_in_user_cart(product_id, quantity)
+    current_item = line_items.where(product_id: product_id).first
+    if current_item
+      current_item.quantity += quantity
+    else
+      current_item = LineItem.new(quantity: quantity, product_id: product_id)
+    end
+    current_item
+  end
+
   def total_price
     line_items.to_a.sum { |item| item.total_price }
   end

app/models/order.rb

@@ -4,6 +4,7 @@ class Order < ActiveRecord::Base
   PAYMENT_TYPES = [ 'Check', 'Credit card', 'Purchase order' ]
 
   has_many :line_items, dependent: :destroy
+  belongs_to :user
 
   validates :name, :address, :email, :pay_type, presence: true
   validates :pay_type, inclusion: PAYMENT_TYPES
@@ -15,6 +16,7 @@ class Order < ActiveRecord::Base
       item.cart_id = nil
       line_items << item
     end
+    self.user_id = cart.user_id
   end
 
   def total_price

app/models/user.rb

 class User < ActiveRecord::Base
+  has_one :cart, dependent: :destroy
+  has_many :orders
+
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable and :omniauthable
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :trackable, :validatable
+
+  def add_line_items_from_cart(old_cart)
+    if cart
+      old_cart.line_items.each do |item|
+        current_item = cart.combine_item_in_user_cart(item.product_id, item.quantity)
+        cart.line_items << current_item
+      end
+    else
+      self.cart = old_cart
+    end    
+  end
 end

app/views/application/_header.html.erb

@@ -14,6 +14,7 @@
               <ul class="dropdown-menu">
                 <li><%= link_to "Order History", '#' %></li>
                 <li><%= link_to "Settings", edit_user_registration_path %></li>
+                <li><%= link_to "Orders History", orders_path %></li>
                 <li class="divider"></li>
                 <li><%= link_to "Log out", destroy_user_session_path, method: "delete" %></li>
               </ul>

app/views/carts/show.html.erb

@@ -9,10 +9,15 @@
 </table>
 <div class='row'>
   <div class='col-md-5'></div>
+  <% if current_cart.line_items.any? %>
     <div class='col-md-1'>
       <%= link_to 'Checkout', new_order_path, class: 'btn btn-default' %>
     </div>
     <div class='col-md-1'>
       <%= link_to 'Empty Cart', current_cart, method: :delete, data: { confirm: 'Are you sure?' }, class: 'btn btn-default' %>
     </div>
+  <% end %>
+  <div class='col-md-1'>
+      <%= link_to 'Buy continue', root_path, class: 'btn btn-default' %>
+  </div>
 </div>

db/migrate/20141112101735_combine_items_in_cart.rb

 class CombineItemsInCart < ActiveRecord::Migration
   def change
+    puts 'runs CombineItemsInCart'
     Cart.all.each do |cart|
       sums = cart.line_items.group(:product_id).sum(:quantity)
 

db/migrate/20141114060031_add_user_id_to_carts.rb

+class AddUserIdToCarts < ActiveRecord::Migration
+  def change
+    add_column :carts, :user_id, :integer
+  end
+end

db/migrate/20141117032233_add_user_id_to_orders.rb

+class AddUserIdToOrders < ActiveRecord::Migration
+  def change
+    add_column :orders, :user_id, :integer
+  end
+end

db/schema.rb

@@ -11,11 +11,12 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20141113084938) do
+ActiveRecord::Schema.define(version: 20141117032233) do
 
   create_table "carts", force: true do |t|
     t.datetime "created_at",           null: false
     t.datetime "updated_at",           null: false
+    t.integer  "user_id",    limit: 4
   end
 
   create_table "categories", force: true do |t|
@@ -40,6 +41,7 @@ ActiveRecord::Schema.define(version: 20141113084938) do
     t.string   "pay_type",   limit: 255
     t.datetime "created_at",               null: false
     t.datetime "updated_at",               null: false
+    t.integer  "user_id",    limit: 4
   end
 
   create_table "products", force: true do |t|

[Nguyen Ngoc Lan]

@phatnt You should move current_cart back to application controller. And use helper_method to expose it to view like:

helper_method :current_cart

[Tan Phat Nguyen]

current_cart is removed in application controller, move it to application_helper