Use new integer value for status

app/services/alert_management/update_alert_status_service.rb

@@ -2,17 +2,19 @@
 
 module AlertManagement
   class UpdateAlertStatusService
+    include Gitlab::Utils::StrongMemoize
+
+    # @param alert [AlertManagement::Alert]
+    # @param status [Integer] Must match a value from AlertManagement::Alert::STATUSES
     def initialize(alert, status)
       @alert = alert
       @status = status
     end
 
     def execute
-      return error('Invalid status') unless AlertManagement::Alert::STATUSES.key?(status.to_sym)
-
-      alert.status_event = AlertManagement::Alert::STATUS_EVENTS[status.to_sym]
+      return error('Invalid status') unless status_key
 
-      if alert.save
+      if alert.update(status_event: status_event)
         success
       else
         error(alert.errors.full_messages.to_sentence)
@@ -23,6 +25,16 @@ module AlertManagement
 
     attr_reader :alert, :status
 
+    def status_key
+      strong_memoize(:status_key) do
+        AlertManagement::Alert::STATUSES.key(status)
+      end
+    end
+
+    def status_event
+      AlertManagement::Alert::STATUS_EVENTS[status_key]
+    end
+
     def success
       ServiceResponse.success(payload: { alert: alert })
     end

spec/graphql/mutations/alert_management/update_alert_status_spec.rb

@@ -6,7 +6,7 @@ describe Mutations::AlertManagement::UpdateAlertStatus do
   let_it_be(:current_user) { create(:user) }
   let_it_be(:alert) { create(:alert_management_alert, status: 'triggered') }
   let_it_be(:project) { alert.project }
-  let(:new_status) { 'acknowledged' }
+  let(:new_status) { Types::AlertManagement::StatusEnum.values['ACKNOWLEDGED'].value }
   let(:args) { { status: new_status, project_path: project.full_path, iid: alert.iid } }
 
   specify { expect(described_class).to require_graphql_authorizations(:update_alert_management_alert) }

spec/services/alert_management/update_alert_status_service_spec.rb

@@ -8,7 +8,7 @@ describe AlertManagement::UpdateAlertStatusService do
   describe '#execute' do
     subject(:execute) { described_class.new(alert, new_status).execute }
 
-    let(:new_status) { 'acknowledged' }
+    let(:new_status) { Types::AlertManagement::StatusEnum.values['ACKNOWLEDGED'].value }
 
     it 'updates the status' do
       expect { execute }.to change { alert.acknowledged? }.to(true)