big start on QuizStatus

app/workers/quiz_status.rb

@@ -0,0 +1,23 @@
+class QuizStatus
+  attr_reader :candidate
+
+  def initialize candidate
+    @candidate = Candidate.find(candidate.to_i)
+  end
+
+  def started
+    candidate.answers.count > 0
+  end
+
+  def on_summary
+    candidate.submitted_answers.count == candidate.questions.count
+  end
+
+  def completed
+    candidate.completed
+  end
+
+  def can_submit
+    on_summary && candidate.answered_questions.count == candidate.questions.count
+  end
+end