Faster uniqueness queries, closes #917

CHANGELOG.rdoc

@@ -1,5 +1,6 @@
 * bug fix
   * Properly ignore path prefix on omniauthable
+  * Faster uniqueness queries
 
 == 1.2.rc2
 

lib/devise.rb

@@ -70,9 +70,9 @@ module Devise
   @@request_keys = []
 
   # Keys that should be case-insensitive.
-  # Empty by default for backwards compatibility.
+  # False by default for backwards compatibility.
   mattr_accessor :case_insensitive_keys
-  @@case_insensitive_keys = []
+  @@case_insensitive_keys = false
 
   # If http authentication is enabled by default.
   mattr_accessor :http_authenticatable

lib/devise/models/authenticatable.rb

@@ -101,7 +101,7 @@ module Devise
         #
         def find_for_authentication(conditions)
           filter_auth_params(conditions)
-          case_insensitive_keys.each { |k| conditions[k].try(:downcase!) }
+          (case_insensitive_keys || []).each { |k| conditions[k].try(:downcase!) }
           to_adapter.find_first(conditions)
         end
 
@@ -112,7 +112,7 @@ module Devise
 
         # Find an initialize a group of attributes based on a list of required attributes.
         def find_or_initialize_with_errors(required_attributes, attributes, error=:invalid) #:nodoc:
-          case_insensitive_keys.each { |k| attributes[k].try(:downcase!) }
+          (case_insensitive_keys || []).each { |k| attributes[k].try(:downcase!) }
           
           attributes = attributes.slice(*required_attributes)
           attributes.delete_if { |key, value| value.blank? }

lib/devise/models/database_authenticatable.rb

@@ -78,7 +78,7 @@ module Devise
 
       # Downcase case-insensitive keys
       def downcase_keys
-        self.class.case_insensitive_keys.each { |k| self[k].try(:downcase!) }
+        (self.class.case_insensitive_keys || []).each { |k| self[k].try(:downcase!) }
       end
 
       # Digests the password using bcrypt.

lib/devise/models/validatable.rb

@@ -24,7 +24,7 @@ module Devise
         base.class_eval do
           validates_presence_of   :email, :if => :email_required?
           validates_uniqueness_of :email, :scope => authentication_keys[1..-1],
-            :case_sensitive => case_insensitive_keys.exclude?(:email), :allow_blank => true
+            :case_sensitive => (case_insensitive_keys != false), :allow_blank => true
           validates_format_of     :email, :with  => email_regexp, :allow_blank => true
 
           with_options :if => :password_required? do |v|