Fix `thread_mattr_accessor` thread-local variable naming

The current implentation of `thread_mattr_accessor` is setting
differently-named thread variables when defining class and
instance writer methods, so the method isn't working as documented:

    Account.user = "DHH"
    Account.user # => "DHH"
    Account.new.user # => nil
    a = Account.new
    a.user = "ABC" # => "ABC"
    a.class.user # => "DHH"

At this point `:attr_Account_user` and `:attr_Class_user` thread-local
variables have been created. Modify the reader and writer methods to use
the class name instead of 'Class'.

1 files changed, 2 insertions, 2 deletions

diff --git a/activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb b/activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb
index 8a7e6776da..0b3d18301e 100644
--- a/activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb
+++ b/activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb
@@ -47,7 +47,7 @@ class Module
       unless options[:instance_reader] == false || options[:instance_accessor] == false
         class_eval(<<-EOS, __FILE__, __LINE__ + 1)
           def #{sym}
-            Thread.current[:"attr_#{self.class.name}_#{sym}"]
+            Thread.current[:"attr_#{name}_#{sym}"]
           end
         EOS
       end
@@ -86,7 +86,7 @@ class Module
       unless options[:instance_writer] == false || options[:instance_accessor] == false
         class_eval(<<-EOS, __FILE__, __LINE__ + 1)
           def #{sym}=(obj)
-            Thread.current[:"attr_#{self.class.name}_#{sym}"] = obj
+            Thread.current[:"attr_#{name}_#{sym}"] = obj
           end
         EOS
       end