Add organizer summary emails

app/jobs/hackathons/digests_delivery_job.rb

@@ -12,6 +12,7 @@ def perform
       sent_digests << digest if digest.persisted?
     end
   ensure
+    Hackathons::SendOrganizerSummariesJob(sent_digests).perform if sent_digests.any?
     Hackathons::DigestMailer.admin_summary(sent_digests).deliver_later if sent_digests.any?
   end
 

app/jobs/hackathons/send_organizer_summaries_job.rb

@@ -0,0 +1,18 @@
+class Hackathons::SendOrganizerSummariesJob < ApplicationJob
+  def perform(sent_digests)
+    # This reloads the (possible) sent_digests array as an
+    # ActiveRecord::Relation so that we can use includes to prevent an N+1.
+    @sent_digests = Hackathon::Digest.where(id: sent_digests.map(&:id))
+
+    @sent_digests_by_hackathons = @sent_digests
+      .includes(listings: :hackathon)
+      .flat_map(&:listings).group_by(&:hackathon)
+      .transform_values { |listings| listings.map(&:digest).uniq }
+
+    @listed_hackathons = @sent_digests_by_hackathons.keys
+    @listed_hackathons.each do |hackathon|
+      sent_digests = @digests_by_hackathons[hackathon]
+      Hackathons::DigestMailer.organizer_summary(hackathon, sent_digests).deliver_later if @sent_digests.any?
+    end
+  end
+end

app/mailers/hackathons/digest_mailer.rb

@@ -31,4 +31,10 @@ def admin_summary(sent_digests)
 
     mail to: Hackathons::SUPPORT_EMAIL, cc: User.admins.collect(&:email_address), subject:
   end
+
+  def organizer_summary(hackathon, sent_digests)
+    @hackathon = hackathon
+    @count = sent_digests.count
+    mail to: hackathon.applicant.email_address, subject: "We've just notified #{@count} hackers about #{hackathon.name}!"
+  end
 end

app/views/hackathons/digest_mailer/organizer_summary.html.erb

@@ -0,0 +1,10 @@
+
+<p>
+  We've just sent an email about <%= @hackathon.name %> to <%= @count %> hackers.
+</p>
+
+<% content_for :signature do %>
+  <p>
+    Best of luck with everything! 🦕 💸
+  </p>
+<% end %>

app/views/hackathons/digest_mailer/organizer_summary.text.erb

@@ -0,0 +1,5 @@
+We've just sent an email about <%= @hackathon.name %> to <%= @count %> hackers.
+
+<% content_for :signature do %>
+  Best of luck with everything! 🦕 💸
+<% end %>

test/mailers/hackathons/organizer_summary_test.rb

@@ -0,0 +1,17 @@
+require "test_helper"
+
+class Hackathons::OrganizerSummaryTest < ActionMailer::TestCase
+  test "organizer_summary" do
+    sent_digests = [hackathon_digests(:one)]
+    hackathon = hackathon_digests(:one).listings.first.hackathon
+    mail = Hackathons::DigestMailer.organizer_summary(hackathon, sent_digests)
+
+    assert_equal "We've just notified #{sent_digests.count} hackers about #{hackathon.name}!", mail.subject
+    assert_equal [hackathon.applicant.email_address], mail.to
+
+    assert_match "We've just sent an email about #{hackathon.name} to #{sent_digests.count} hackers.", mail.body.encoded
+
+    # Email CAN-SPAM compliance
+    assert_match Hackathons::HACK_CLUB_ADDRESS[:full], mail.body.encoded
+  end
+end