diff --git a/app/models/test_pair.rb b/app/models/test_pair.rb
--- a/app/models/test_pair.rb
+++ b/app/models/test_pair.rb
@@ -1,3 +1,8 @@
 class TestPair < ActiveRecord::Base
   belongs_to :problem
+
+  def self.get_for(problem, is_private)
+    return TestPair.where(:problem_id => problem.id,
+                          :is_private => is_private).first
+  end
 end