001_create_products.rb

class CreateProducts < ActiveRecord::Migration
def self.up
create_table :products do |t|
t.column :title, :string
t.column :description, :text
t.column :image_url, :string
end
end
def self.down
drop_table :products
end
end

admin_controller.rb

class AdminController < ApplicationController
  scaffold :product
end

database.yml

development:
  adapter: mysql
  encoding: utf8
  database: depot_development
  username: root
  password: password

test:
  adapter: mysql
  encoding: utf8
  database: depot_test
  username: root
  password: password

production:
  adapter: mysql
  encoding: utf8
  database: depot_production
  username: root
  password: password