No point in changing the name of the OpenID identity column in users table. Use the existing one.

app/controllers/login_controller.rb

@@ -96,7 +96,7 @@ class LoginController < ApplicationController
     session['noexpiry'] ||= params['user_noexpiry']
     authenticate_with_open_id do |result, identity_url|
       if result.successful?
-        if @user = User.find_by_identity_url(identity_url)
+        if @user = User.find_by_open_id_url(identity_url)
           session['user_id'] = @user.id
           msg = (should_expire_sessions?) ? "will expire after 1 hour of inactivity." : "will not expire." 
           notify :notice, "Login successful: session #{msg}"

app/controllers/users_controller.rb

@@ -154,7 +154,7 @@ class UsersController < ApplicationController
           # error. If info is nil, it means that the user cancelled
           # the verification.
           @user.auth_type = 'open_id'
-          @user.identity_url = identity_url
+          @user.open_id_url = identity_url
           if @user.save
             notify :notice, "You have successfully verified #{identity_url} as your identity and set your authentication type to Open ID."
           else

app/models/user.rb

@@ -116,11 +116,11 @@ class User < ActiveRecord::Base
   validates_confirmation_of :password  
   validates_length_of :login, :within => 3..80
   validates_uniqueness_of :login, :on => :create
-  validates_presence_of :identity_url, :if => :using_openid?
+  validates_presence_of :open_id_url, :if => :using_openid?
 
   before_create :crypt_password, :generate_token
   before_update :crypt_password
-  before_save :normalize_identity_url
+  before_save :normalize_open_id_url
 
   #for will_paginate plugin
   cattr_accessor :per_page
@@ -145,9 +145,9 @@ class User < ActiveRecord::Base
     return nil
   end
   
-  def self.find_by_identity_url(raw_identity_url)
-    normalized_identity_url = OpenIdAuthentication.normalize_url(raw_identity_url)
-    find(:first, :conditions => ['identity_url = ?', normalized_identity_url])
+  def self.find_by_open_id_url(raw_identity_url)
+    normalized_open_id_url = OpenIdAuthentication.normalize_url(raw_identity_url)
+    find(:first, :conditions => ['open_id_url = ?', normalized_open_id_url])
   end
   
   def self.no_users_yet?
@@ -235,8 +235,8 @@ protected
     crypted_password == sha1(pass)
   end
   
-  def normalize_identity_url
-    return if identity_url.nil?
-    self.identity_url = OpenIdAuthentication.normalize_url(identity_url)
+  def normalize_open_id_url
+    return if open_id_url.nil?
+    self.open_id_url = OpenIdAuthentication.normalize_url(open_id_url)
   end
 end

db/migrate/044_upgrade_open_id.rb

@@ -12,8 +12,6 @@ class UpgradeOpenId < ActiveRecord::Migration
       t.string :salt, :null => false
     end
     
-    add_column :users, :identity_url, :string
-    
     drop_table :open_id_associations
     drop_table :open_id_nonces
     drop_table :open_id_settings
@@ -41,7 +39,5 @@ class UpgradeOpenId < ActiveRecord::Migration
       t.string "setting"
       t.binary "value"
     end
-
-    remove_column :users, :identity_url
   end
 end

test/unit/user_test.rb

@@ -326,18 +326,18 @@ class UserTest < Test::Rails::TestCase
     assert_nil users(:other_user).remember_token
   end
   
-  def test_normalizes_identity_url_on_save
+  def test_normalizes_open_id_url_on_save
     ['www.johndoe.com', 'WWW.JOHNDOE.COM', 'http://www.johndoe.com/', 'http://www.johndoe.com'].each do |initial|
-      assert_identity_url_normalized_on_save initial, 'http://www.johndoe.com/'
+      assert_open_id_url_normalized_on_save initial, 'http://www.johndoe.com/'
     end
   end
   
-  def test_normalizes_identity_url_on_find
+  def test_normalizes_open_id_url_on_find
      u = users(:other_user)
-     u.identity_url = 'http://www.johndoe.com'
+     u.open_id_url = 'http://www.johndoe.com'
      u.save
-     ['www.johndoe.com', 'WWW.JOHNDOE.COM', 'http://www.johndoe.com/', 'http://www.johndoe.com'].each do |raw_identity_url|
-       assert_equal u.id, User.find_by_identity_url(raw_identity_url).id
+     ['www.johndoe.com', 'WWW.JOHNDOE.COM', 'http://www.johndoe.com/', 'http://www.johndoe.com'].each do |raw_open_id_url|
+       assert_equal u.id, User.find_by_open_id_url(raw_open_id_url).id
      end
   end
   
@@ -348,11 +348,11 @@ class UserTest < Test::Rails::TestCase
       User.create({ :login => 'quire', :password => 'quire', :password_confirmation => 'quire' }.merge(options))
     end
     
-    def assert_identity_url_normalized_on_save(initial, expected)
+    def assert_open_id_url_normalized_on_save(initial, expected)
       u = users(:other_user)
-      u.identity_url = initial
+      u.open_id_url = initial
       u.save
-      assert_equal expected, u.identity_url
+      assert_equal expected, u.open_id_url
     end
     
 end