Fix typo

nygrenh · nygrenh · commit 023aae9fb885 · 2018-09-12T11:36:52.000+03:00
diff --git a/app/models/exercise.rb b/app/models/exercise.rb
@@ -453,7 +453,7 @@ def toggle_submission_result_visiblity
     save!
   end
 
-  def deadline_expired?(deadline, time = Time.now)
+  def self.deadline_expired?(deadline, time = Time.now)
     deadline != nil && deadline < time
   end
 
