Add many to many relation between orders and products

app/models/order.rb

@@ -1,5 +1,8 @@
 class Order < ActiveRecord::Base
   belongs_to :users
+  has_many :order_products
+  has_many :products, through: :order_products
+
   default_scope -> { order('created_at DESC') }
 
 end

app/models/order_product.rb

@@ -0,0 +1,4 @@
+class OrderProduct < ActiveRecord::Base
+  belongs_to :order
+  belongs_to :product
+end

db/migrate/20141125130213_drop_products_on_users.rb

@@ -0,0 +1,5 @@
+class DropProductsOnUsers < ActiveRecord::Migration
+  def change
+    remove_column :orders, :products
+  end
+end

db/migrate/20141125130447_create_order_products.rb

@@ -0,0 +1,8 @@
+class CreateOrderProducts < ActiveRecord::Migration
+  def change
+    create_table :order_products do |t|
+      t.belongs_to :order
+      t.belongs_to :product
+    end
+  end
+end

db/schema.rb

@@ -11,11 +11,15 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20141125102501) do
+ActiveRecord::Schema.define(version: 20141125130447) do
+
+  create_table "order_products", force: true do |t|
+    t.integer "order_id"
+    t.integer "product_id"
+  end
 
   create_table "orders", force: true do |t|
     t.integer  "user_id"
-    t.string   "products"
     t.integer  "cost"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false

test/fixtures/order_products.yml

@@ -0,0 +1,11 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+# This model initially had no columns defined.  If you add columns to the
+# model remove the '{}' from the fixture names and add the columns immediately
+# below each fixture, per the syntax in the comments below
+#
+one: {}
+# column: value
+#
+two: {}
+#  column: value

test/models/order_product_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class OrderProductTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end