reminders in play!

app/workers/reminder.rb

@@ -0,0 +1,37 @@
+class Reminder
+  def initialize
+    @collection = reminder_collection
+  end
+
+  def count
+    @collection.count
+  end
+  alias size count
+
+  def candidates
+    Candidate.includes(:recruiter).where(id: @collection.map { |row| row['id'] })
+  end
+
+  def send_all
+    candidates.each do |candidate|
+      CandidateMailer.reminder(candidate).deliver_now
+      flag_as_reminded candidate.id
+    end
+  end
+
+  private
+
+    def reminder_collection
+      sql = "select c.id, c.test_hash, c.name, c.email, max(a.updated_at) last_updated
+             from candidates c
+               inner join answers a on a.candidate_id = c.id
+             where completed = false and reminded = false
+             group by c.id
+             having MAX(a.updated_at) < DATE_SUB(NOW(), INTERVAL 24 HOUR);"
+      ActiveRecord::Base.connection.exec_query(sql)
+    end
+
+    def flag_as_reminded candidate_id
+      Candidate.find(candidate_id).update(reminded: true)
+    end
+end