Add before_save :downcase_email filter

app/models/extensions/authentication.rb

@@ -20,15 +20,15 @@ module Authentication
       validates_confirmation_of :password, :allow_blank => true
       validates_length_of :password, :within => 6..40, :allow_blank => true
 
-      before_save :prepare_password
+      before_save :prepare_password, :downcase_email
       before_create { generate_token(:remember_token) }
       before_create { generate_token(:confirmation_token) unless authenticated_with_omniauth? }
       after_create { send_confirmation_instructions_and_save unless authenticated_with_omniauth? }
     end
 
     module ClassMethods
       def authenticate(email, pass)
-        user = where('email = ? AND confirmed_at IS NOT NULL', email).first
+        user = where('email = ? AND confirmed_at IS NOT NULL', email.downcase).first
         return user if user && user.password_hash == user.encrypt_password(pass)
       end
 
@@ -122,6 +122,10 @@ def prepare_password
         end
       end
 
+      def downcase_email
+        email.downcase! if email.present?
+      end
+
       def generate_token(column)
         begin
           self[column] = SecureRandom.urlsafe_base64

config/initializers/controller_name.rb

@@ -0,0 +1,7 @@
+class ActionController::Metal
+  def self.controller_name
+    # @controller_name ||= self.name.demodulize.sub(/Controller$/, '').underscore
+    @controller_name ||= self.name.sub(/Controller$/, '').underscore
+  end
+end
+

spec/models/user_spec.rb

@@ -12,7 +12,7 @@
 
   context 'authentication' do
     it 'should return the user object if the credentials match' do
-      User.authenticate(user.email, user.password).should == user
+      User.authenticate(user.email.upcase, user.password).should == user
     end
 
     it 'should return nil if the credentials do not match' do
@@ -104,5 +104,11 @@
     end
   end
 
+  it 'downcases email on user#save' do
+    user.email = 'JOE@EXAMPLE.COM'
+    user.save
+    user.reload
+    user.email.should == 'joe@example.com'
+  end
 end
 

spec/requests/rememberable_spec.rb

@@ -15,7 +15,7 @@
     current_path.should == dashboard_path
 
     # simulate closing the browser
-    # this deletes the session cookie and any expired cookies so our remember_me cookie stays untouched
+    # this deletes the session cookie and any expired cookies, but our remember_me cookie stays untouched
     # (see the show_me_the_cookies gem)
     expire_cookies