Refactor: extract method Question#score_for_answer

* First step towards Move Method

Author: jferris

example_app/app/models/completion.rb

@@ -15,8 +15,7 @@ def answers_attributes=(answers_attributes)
 
   def score
     answers.inject(0) do |result, answer|
-      question = answer.question
-      result + question.score(answer.text)
+      result + score_for_answer(answer)
     end
   end
 
@@ -25,4 +24,9 @@ def score
   def completion_notification
     Mailer.completion_notification(user).deliver
   end
+
+  def score_for_answer(answer)
+    question = answer.question
+    question.score(answer.text)
+  end
 end