use underlying _read_attribute method rather than causing NoMethodErrors

activerecord/lib/active_record/base.rb

@@ -1578,7 +1578,7 @@ MSG
       # Returns true if the specified +attribute+ has been set by the user or by a database load and is neither
       # nil nor empty? (the latter only applies to objects that respond to empty?, most notably Strings).
       def attribute_present?(attribute)
-        !read_attribute(attribute).blank?
+        !_read_attribute(attribute).blank?
       end
 
       # Returns the column object for the named attribute.

activerecord/test/cases/associations/join_model_test.rb

@@ -523,7 +523,7 @@ class AssociationsJoinModelTest < ActiveRecord::TestCase
 
   def test_has_many_through_collection_size_uses_counter_cache_if_it_exists
     author = authors(:david)
-    author.stubs(:read_attribute).with('comments_count').returns(100)
+    author.stubs(:_read_attribute).with('comments_count').returns(100)
     assert_equal 100, author.comments.size
     assert !author.comments.loaded?
   end