Merge branch 'adamliesko/gitlab-ce-notification-upon-unassignment' into 'master'

Add notification to the former assignee upon unassignment

Replaces !1769

Fixes #3395

See merge request !1818

CHANGELOG

@@ -34,6 +34,7 @@ v 8.2.0
   - Add "added", "modified" and "removed" properties to commit object in webhook
   - Rename "Back to" links to "Go to" because its not always a case it point to place user come from
   - Allow groups to appear in the search results if the group owner allows it
+  - Add email notification to former assignee upon unassignment (Adam Lieskovský)
   - New design for project graphs page
   - Remove deprecated dumped yaml file generated from previous job definitions
   - Fix incoming email config defaults

app/services/notification_service.rb

@@ -351,11 +351,13 @@ class NotificationService
   end
   def reassign_resource_email(target, project, current_user, method)
-    assignee_id_was = previous_record(target, "assignee_id")
-    recipients = build_recipients(target, project, current_user)
+    previous_assignee_id = previous_record(target, "assignee_id")
+    previous_assignee = User.find_by(id: previous_assignee_id) if previous_assignee_id
+
+    recipients = build_recipients(target, project, current_user, [previous_assignee])
     recipients.each do |recipient|
-      mailer.send(method, recipient.id, target.id, assignee_id_was, current_user.id)
+      mailer.send(method, recipient.id, target.id, previous_assignee_id, current_user.id)
     end
   end
@@ -367,9 +369,11 @@ class NotificationService
     end
   end
-  def build_recipients(target, project, current_user)
+  def build_recipients(target, project, current_user, extra_recipients = nil)
     recipients = target.participants(current_user)
+    recipients = recipients.concat(extra_recipients).compact.uniq if extra_recipients
+
     recipients = add_project_watchers(recipients, project)
     recipients = reject_mention_users(recipients, project)
     recipients = reject_muted_users(recipients, project)

spec/services/issues/update_service_spec.rb

@@ -3,13 +3,15 @@ require 'spec_helper'
 describe Issues::UpdateService do
   let(:user) { create(:user) }
   let(:user2) { create(:user) }
-  let(:issue) { create(:issue, title: 'Old title') }
+  let(:user3) { create(:user) }
+  let(:issue) { create(:issue, title: 'Old title', assignee_id: user3.id) }
   let(:label) { create(:label) }
   let(:project) { issue.project }
   before do
     project.team << [user, :master]
     project.team << [user2, :developer]
+    project.team << [user3, :developer]
   end
   describe 'execute' do
@@ -34,9 +36,11 @@ describe Issues::UpdateService do
       it { expect(@issue.labels.count).to eq(1) }
       it { expect(@issue.labels.first.title).to eq('Bug') }
-      it 'should send email to user2 about assign of new issue' do
-        email = ActionMailer::Base.deliveries.last
-        expect(email.to.first).to eq(user2.email)
+      it 'should send email to user2 about assign of new issue and email to user3 about issue unassignment' do
+        deliveries = ActionMailer::Base.deliveries
+        email = deliveries.last
+        recipients = deliveries.last(2).map(&:to).flatten
+        expect(recipients).to include(user2.email, user3.email)
         expect(email.subject).to include(issue.title)
       end

spec/services/merge_requests/update_service_spec.rb

@@ -3,7 +3,8 @@ require 'spec_helper'
 describe MergeRequests::UpdateService do
   let(:user) { create(:user) }
   let(:user2) { create(:user) }
-  let(:merge_request) { create(:merge_request, :simple, title: 'Old title') }
+  let(:user3) { create(:user) }
+  let(:merge_request) { create(:merge_request, :simple, title: 'Old title', assignee_id: user3.id) }
   let(:project) { merge_request.project }
   let(:label) { create(:label) }
@@ -47,9 +48,11 @@ describe MergeRequests::UpdateService do
                                with(@merge_request, 'update')
       end
-      it 'should send email to user2 about assign of new merge_request' do
-        email = ActionMailer::Base.deliveries.last
-        expect(email.to.first).to eq(user2.email)
+      it 'should send email to user2 about assign of new merge request and email to user3 about merge request unassignment' do
+        deliveries = ActionMailer::Base.deliveries
+        email = deliveries.last
+        recipients = deliveries.last(2).map(&:to).flatten
+        expect(recipients).to include(user2.email, user3.email)
         expect(email.subject).to include(merge_request.title)
       end