add column full_score_reached, fill it accordingly and show information in the rfc index

db/migrate/20180130172021_add_reached_full_score_to_request_for_comment.rb

@@ -0,0 +1,15 @@
+class AddReachedFullScoreToRequestForComment < ActiveRecord::Migration
+  def up
+    add_column :request_for_comments, :full_score_reached, :boolean, default: false
+    RequestForComment.all.each { |rfc|
+      if (rfc.submission.exercise.has_user_solved(rfc.user))
+        rfc.full_score_reached = true
+        rfc.save
+      end
+    }
+  end
+
+  def down
+    remove_column :request_for_comments, :full_score_reached
+  end
+end