Observe secondary email addresses when adding a member

- needed to match UI functionality and desired
  functionality.

Changelog: changed

app/models/member.rb

@@ -334,7 +334,7 @@ class Member < ApplicationRecord
 
       return User.find_by(id: user) if user.is_a?(Integer)
 
-      User.find_by(email: user) || user
+      User.find_by_any_email(user) || user
     end
 
     def retrieve_member(source, user, existing_members)

changelogs/unreleased/329319-observe-secondary-email-addresses-when-adding-a-member.yml

+---
+title: Observe secondary email addresses when adding a member
+merge_request: 62024
+author:
+type: changed

spec/models/member_spec.rb

@@ -580,6 +580,18 @@ RSpec.describe Member do
             end
           end
 
+          context 'when called with a known user secondary email' do
+            let(:secondary_email) { create(:email, email: 'secondary@example.com', user: user) }
+
+            it 'adds the user as a member' do
+              expect(source.users).not_to include(user)
+
+              described_class.add_user(source, secondary_email.email, :maintainer)
+
+              expect(source.users.reload).to include(user)
+            end
+          end
+
           context 'when called with an unknown user email' do
             it 'creates an invited member' do
               expect(source.users).not_to include(user)

spec/services/members/invite_service_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe Members::InviteService, :aggregate_failures, :clean_gitlab_redis_shared_state, :sidekiq_inline do
-  let_it_be(:project) { create(:project) }
+  let_it_be(:project, reload: true) { create(:project) }
   let_it_be(:user) { project.owner }
   let_it_be(:project_user) { create(:user) }
   let_it_be(:namespace) { project.namespace }
@@ -23,6 +23,18 @@ RSpec.describe Members::InviteService, :aggregate_failures, :clean_gitlab_redis_
     it_behaves_like 'records an onboarding progress action', :user_added
   end
 
+  context 'when email belongs to an existing user as a secondary email' do
+    let(:secondary_email) { create(:email, email: 'secondary@example.com', user: project_user) }
+    let(:params) { { email: secondary_email.email } }
+
+    it 'adds an existing user to members', :aggregate_failures do
+      expect_to_create_members(count: 1)
+      expect(result[:status]).to eq(:success)
+      expect(project.users).to include project_user
+      expect(project.members.last).not_to be_invite
+    end
+  end
+
   context 'when email is not a valid email' do
     let(:params) { { email: '_bogus_' } }