elation between products and categories

app/controllers/products_controller.rb

@@ -16,4 +16,8 @@ def create
     end
    render :new
   end
+
+  def show
+    @product = Product.find_by_id params[:id]
+  end
 end

app/models/category.rb

@@ -0,0 +1,7 @@
+class Category < ActiveRecord::Base
+  has_many :products
+
+  attr_accessible :name
+
+  validates :name, presence: true
+end

app/models/product.rb

@@ -1,6 +1,8 @@
 class Product < ActiveRecord::Base
   before_save :set_defaults
 
+  belongs_to :category
+
   attr_accessible :active, :description, :name, :price
 
   validates :name, presence: true

app/views/products/show.html.erb

@@ -0,0 +1,13 @@
+<h1>Product</h1>
+<% if @product.nil? %>
+  <h3>Product not found</h3>
+<% else %>
+  <p>
+  <span>Name: </span><%= @product.name %>
+  </p>
+  <p>
+  <span>Description: </span><%= @product.description %>
+  </p>
+  <p>
+<% end %>
+<%= link_to :back %>

db/migrate/20130126203942_create_categories.rb

@@ -0,0 +1,9 @@
+class CreateCategories < ActiveRecord::Migration
+  def change
+    create_table :categories do |t|
+      t.string :name
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20130126204442_add_category_id_to_product.rb

@@ -0,0 +1,5 @@
+class AddCategoryIdToProduct < ActiveRecord::Migration
+  def change
+    add_column :products, :category_id, :integer
+  end
+end

db/schema.rb

@@ -11,7 +11,13 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130126162834) do
+ActiveRecord::Schema.define(:version => 20130126204442) do
+
+  create_table "categories", :force => true do |t|
+    t.string   "name"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
 
   create_table "products", :force => true do |t|
     t.string   "name"
@@ -20,6 +26,7 @@
     t.boolean  "active"
     t.datetime "created_at",  :null => false
     t.datetime "updated_at",  :null => false
+    t.integer  "category_id"
   end
 
 end

test/fixtures/categories.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/Fixtures.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString

test/unit/category_test.rb

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