add quantity to cart_items

Author: xdite

app/controllers/products_controller.rb

@@ -14,7 +14,7 @@ def add_to_cart
     @product = Product.find(params[:id])
 
     if !current_cart.items.include?(@product)
-      current_cart.add_product_to_cart(@product)
+      current_cart.add_product_to_cart(@product, 1)
       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"

app/models/cart.rb

@@ -14,7 +14,10 @@ class Cart < ActiveRecord::Base
 
 
   def add_product_to_cart(product)
-    items << product
+    cart_item = cart_items.build
+    cart_item.product = product
+    cart_item.quantity = amount
+    cart_item.save
   end
 
   def total_price

db/migrate/20140619164232_add_quantity_to_cart_item.rb

@@ -0,0 +1,5 @@
+class AddQuantityToCartItem < ActiveRecord::Migration
+  def change
+    add_column :cart_items, :quantity,:integer, :default => 1
+  end
+end

db/schema.rb

@@ -11,13 +11,14 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20140613065223) do
+ActiveRecord::Schema.define(version: 20140619164232) do
 
   create_table "cart_items", force: true do |t|
     t.integer  "cart_id"
     t.integer  "product_id"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.integer  "quantity",   default: 1
   end
 
   create_table "carts", force: true do |t|