Invite teammates backend side

When passing emails from the frontend,
send invitations when creating a group

ee/app/controllers/registrations/groups_controller.rb

@@ -15,6 +15,8 @@ module Registrations
       @group = Groups::CreateService.new(current_user, group_params).execute
 
       if @group.persisted?
+        invite_teammates
+
         redirect_to new_users_sign_up_project_path(namespace_id: @group.id)
       else
         render action: :new
@@ -31,8 +33,21 @@ module Registrations
       access_denied! unless experiment_enabled?(:onboarding_issues)
     end
 
+    def invite_teammates
+      invite_params = {
+        user_ids: emails_param[:emails].reject(&:blank?).join(','),
+        access_level: Gitlab::Access::DEVELOPER
+      }
+
+      Members::CreateService.new(current_user, invite_params).execute(@group)
+    end
+
     def group_params
       params.require(:group).permit(:name, :path, :visibility_level)
     end
+
+    def emails_param
+      params.require(:group).permit(emails: [])
+    end
   end
 end

ee/spec/controllers/registrations/groups_controller_spec.rb

@@ -48,7 +48,7 @@ RSpec.describe Registrations::GroupsController do
   describe 'POST #create' do
     subject { post :create, params: { group: params } }
 
-    let(:params) { { name: 'Group name', path: 'group-path', visibility_level: Gitlab::VisibilityLevel::PRIVATE } }
+    let(:params) { { name: 'Group name', path: 'group-path', visibility_level: Gitlab::VisibilityLevel::PRIVATE, emails: ['', ''] } }
 
     context 'with an unauthenticated user' do
       it { is_expected.to have_gitlab_http_status(:redirect) }
@@ -68,6 +68,46 @@ RSpec.describe Registrations::GroupsController do
       it { is_expected.to have_gitlab_http_status(:redirect) }
       it { is_expected.to redirect_to(new_users_sign_up_project_path(namespace_id: user.groups.last.id)) }
 
+      context 'inviting teammates' do
+        context 'with no valid emails in the params' do
+          it 'does not add teammates' do
+            expect { subject }.to change(Member, :count).by(1)
+          end
+
+          it 'does not call the Members::CreateService' do
+            expect(Members::CreateService).not_to receive(:new)
+          end
+        end
+
+        context 'with valid emails in the params' do
+          before do
+            params[:emails] = ['a@a.a', 'b@b.b', '', '', 'x', 'y']
+          end
+
+          it 'adds users with developer access and ignores blank emails' do
+            expect_next_instance_of(Group) do |group|
+              expect(group).to receive(:add_users).with(
+                ['a@a.a', 'b@b.b', 'x', 'y'],
+                Gitlab::Access::DEVELOPER,
+                expires_at: nil,
+                current_user: user
+              ).and_call_original
+            end
+
+            subject
+          end
+
+          it 'sends invitations to valid emails only' do
+            subject
+
+            emails = assigns(:group).members.pluck(:invite_email)
+
+            expect(emails).to include('a@a.a', 'b@b.b')
+            expect(emails).not_to include('x', 'y')
+          end
+        end
+      end
+
       context 'when the group cannot be saved' do
         let(:params) { { name: '', path: '' } }