Group entity. Group has many projects

db/migrate/20121002150926_create_groups.rb

@@ -0,0 +1,11 @@
+class CreateGroups < ActiveRecord::Migration
+  def change
+    create_table :groups do |t|
+      t.string :name, null: false
+      t.string :code, null: false
+      t.integer :owner_id, null: false
+
+      t.timestamps
+    end
+  end
+end