completes #84 : interview request status tweaks

app/models/candidate.rb

@@ -23,6 +23,11 @@ class Candidate < ApplicationRecord
     declined: 2
   }
 
+  def interview?
+    return 'yes' if approved?
+    'no' if declined?
+  end
+
   def build_reviews
     reviewers.each do |reviewer|
       votes.find_or_create_by(user_id: reviewer.id)