2 files changed, 8 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index 1c753524de..177d156834 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -233,7 +233,7 @@ module ActiveRecord
       method_name = method_id.to_s
 
       if self.class.private_method_defined?(method_name)
-        raise NoMethodError("Attempt to call private method", method_name, args)
+        raise NoMethodError.new("Attempt to call private method", method_name, args)
       end
 
       # If we haven't generated any methods yet, generate them, then
diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index 160716f944..77ee8d8fc4 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -233,8 +233,9 @@ class AttributeMethodsTest < ActiveRecord::TestCase
 
     topic = @target.new(:title => "The pros and cons of programming naked.")
     assert !topic.respond_to?(:title)
-    assert_raise(NoMethodError) { topic.title }
-    topic.send(:title)
+    exception = assert_raise(NoMethodError) { topic.title }
+    assert_equal "Attempt to call private method", exception.message
+    assert_equal "I'm private", topic.send(:title)
   end
 
   def test_write_attributes_respect_access_control
@@ -242,7 +243,8 @@ class AttributeMethodsTest < ActiveRecord::TestCase
 
     topic = @target.new
     assert !topic.respond_to?(:title=)
-    assert_raise(NoMethodError) { topic.title = "Pants"}
+    exception = assert_raise(NoMethodError) { topic.title = "Pants"}
+    assert_equal "Attempt to call private method", exception.message
     topic.send(:title=, "Very large pants")
   end
 
@@ -251,7 +253,8 @@ class AttributeMethodsTest < ActiveRecord::TestCase
 
     topic = @target.new(:title => "Isaac Newton's pants")
     assert !topic.respond_to?(:title?)
-    assert_raise(NoMethodError) { topic.title? }
+    exception = assert_raise(NoMethodError) { topic.title? }
+    assert_equal "Attempt to call private method", exception.message
     assert topic.send(:title?)
   end