attr_readonly uses a set of strings instead of an array of symbols internally. References #10300.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8230 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/base.rb

@@ -672,7 +672,7 @@ module ActiveRecord #:nodoc:
 
        # Attributes listed as readonly can be set for a new record, but will be ignored in database updates afterwards.
        def attr_readonly(*attributes)
-         write_inheritable_array("attr_readonly", attributes - (readonly_attributes || []))
+         write_inheritable_attribute("attr_readonly", Set.new(attributes.map(&:to_s)) + (readonly_attributes || []))
        end
 
        # Returns an array of all the attributes that have been specified as readonly.
@@ -2103,7 +2103,7 @@ module ActiveRecord #:nodoc:
       # Removes attributes which have been marked as readonly.
       def remove_readonly_attributes(attributes)
         unless self.class.readonly_attributes.nil?
-          attributes.delete_if { |key, value| self.class.readonly_attributes.include?(key.gsub(/\(.+/,"").intern) }
+          attributes.delete_if { |key, value| self.class.readonly_attributes.include?(key.gsub(/\(.+/,"")) }
         else
           attributes
         end

activerecord/test/base_test.rb

@@ -856,7 +856,7 @@ class BasicsTest < Test::Unit::TestCase
   end
   
   def test_readonly_attributes
-    assert_equal [ :title ], ReadonlyTitlePost.readonly_attributes
+    assert_equal Set.new([ 'title' ]), ReadonlyTitlePost.readonly_attributes
     
     post = ReadonlyTitlePost.create(:title => "cannot change this", :body => "changeable")
     post.reload

activerecord/test/locking_test.rb

@@ -99,7 +99,7 @@ class OptimisticLockingTest < Test::Unit::TestCase
   end
 
   def test_readonly_attributes
-    assert_equal [ :first_name ], ReadonlyFirstNamePerson.readonly_attributes
+    assert_equal Set.new([ 'first_name' ]), ReadonlyFirstNamePerson.readonly_attributes
 
     p = ReadonlyFirstNamePerson.create(:first_name => "unchangeable name")
     p.reload