Add audit log to registrant verifications

Closes #1425

app/models/domain.rb

@@ -57,6 +57,7 @@ class Domain < ApplicationRecord
 
   has_many :legal_documents, as: :documentable
   accepts_nested_attributes_for :legal_documents, reject_if: proc { |attrs| attrs[:body].blank? }
+  has_many :registrant_verifications, dependent: :destroy
 
   after_initialize do
     self.pending_json = {} if pending_json.blank?

app/models/registrant_verification.rb

@@ -1,6 +1,8 @@
 # Used in Registrant portal to collect registrant verifications
 # Registrant postgres user can access this table directly.
 class RegistrantVerification < ApplicationRecord
+  has_paper_trail
+
   # actions
   CONFIRMED = 'confirmed'
   REJECTED  = 'rejected'

lib/tasks/data_migrations/delete_orphaned_registrant_verifications.rake

@@ -0,0 +1,15 @@
+namespace :data_migrations do
+  task delete_orphaned_registrant_verifications: :environment do
+    orphaned_registrant_verifications = RegistrantVerification.where.not(domain_id: Domain.ids)
+    orphaned_registrant_verification_count = orphaned_registrant_verifications.count
+    processed_registrant_verification_count = 0
+
+    orphaned_registrant_verifications.each do |registrant_verification|
+      registrant_verification.destroy!
+      processed_registrant_verification_count += 1
+    end
+
+    puts "Processed: #{processed_registrant_verification_count} out of" \
+      " #{orphaned_registrant_verification_count}"
+  end
+end

test/models/registrant_verification_test.rb

@@ -0,0 +1,12 @@
+require 'test_helper'
+
+class RegistrantVerificationTest < ActiveSupport::TestCase
+  def test_audit_log
+    registrant_verification = registrant_verifications(:one)
+    random_action = "random#{rand(100)}"
+
+    assert_difference -> { PaperTrail::Version.count } do
+      registrant_verification.update_attributes!(action: random_action)
+    end
+  end
+end

test/tasks/data_migrations/delete_orphaned_registrant_verifications_test.rb

@@ -0,0 +1,43 @@
+require 'test_helper'
+
+class ArchiveOrphanedRegistrantVerificationsTest < ActiveSupport::TestCase
+  def test_deletes_orphaned_registrant_verifications
+    create_orphaned_registrant_verification
+
+    assert_difference 'RegistrantVerification.count', -1 do
+      capture_io do
+        run_task
+      end
+    end
+  end
+
+  def test_keeps_non_orphaned_registrant_verifications_intact
+    assert_no_difference 'RegistrantVerification.count' do
+      capture_io do
+        run_task
+      end
+    end
+  end
+
+  def test_output
+    create_orphaned_registrant_verification
+
+    assert_output "Processed: 1 out of 1\n" do
+      run_task
+    end
+  end
+
+  private
+
+  def create_orphaned_registrant_verification
+    non_existent_domain_id = 55
+    assert_not_includes Domain.ids, non_existent_domain_id
+
+    RegistrantVerification.connection.disable_referential_integrity do
+      registrant_verifications(:one).update_columns(domain_id: non_existent_domain_id)
+    end
+  end
+
+  def run_task
+    Rake::Task['data_migrations:delete_orphaned_registrant_verifications'].execute end
+end