Rails3: scm: cvs: fix error of test_diff_new_files at unit model test
On Rails 3.1, ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection error raises. For more details, see r7062.
Authored by: tmaruyama 2011-09-12
Parent: [r7173]
Child: [r7175]
