Change identification of users with extern auth provider (LDAP)

db/migrate/20120729131232_add_extern_auth_provider_to_users.rb

@@ -0,0 +1,8 @@
+class AddExternAuthProviderToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :extern_uid, :string
+    add_column :users, :provider, :string
+
+    add_index :users, [:extern_uid, :provider], :unique => true
+  end
+end