Fix issue adding schedule to an existing dast profile

ee/app/services/app_sec/dast/profiles/update_service.rb

@@ -99,9 +99,9 @@ module AppSec
 
           # params[:dast_profile_schedule] is `Types::Dast::ProfileScheduleInputType` object.
           # Using to_h method to convert object into equivalent hash.
-          dast_profile_schedule_params = params[:dast_profile_schedule]
+          dast_profile_schedule_params = params[:dast_profile_schedule]&.to_h
           dast_profile_schedule_params[:user_id] = current_user.id unless schedule&.owner_valid?
-          dast_profile_schedule_params&.to_h
+          dast_profile_schedule_params
         end
 
         def build_auditors!

ee/spec/factories/dast/profile_schedule_input_type.rb

+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :dast_profile_schedule_input_type, class: 'Types::Dast::ProfileScheduleInputType' do
+    context = GraphQL::Query::Context.new(
+      query: GraphQL::Query.new(GitlabSchema, document: nil, context: {}, variables: {}),
+      values: {},
+      object: nil
+    )
+    skip_create
+
+    arguments = {
+      active: true,
+      timezone: ActiveSupport::TimeZone.all.map { |tz| tz.tzinfo.identifier }.sample,
+      startsAt: Time.now,
+      cadence: { unit: %w(day month year week).sample, duration: 1 }
+    }
+    ::Types::Dast::ProfileScheduleInputType.to_graphql
+
+    initialize_with { ::Types::Dast::ProfileScheduleInputType.new(arguments, defaults_used: [], context: context) }
+  end
+end

ee/spec/graphql/mutations/dast/profiles/update_spec.rb

@@ -120,6 +120,29 @@ RSpec.describe Mutations::Dast::Profiles::Update do
           end
         end
 
+        context 'when associated dast profile schedule is not present' do
+          context 'when dast_profile_schedule param is present' do
+            let(:new_dast_profile_schedule) { create(:dast_profile_schedule_input_type) }
+
+            subject do
+              mutation.resolve(**params.merge(dast_profile_schedule: new_dast_profile_schedule))
+            end
+
+            it 'creates the profile schedule' do
+              subject
+
+              new_schedule = dast_profile.reload.dast_profile_schedule
+
+              aggregate_failures do
+                expect(new_schedule.timezone).to eq(new_dast_profile_schedule[:timezone])
+                expect(new_schedule.starts_at.to_i).to eq(new_dast_profile_schedule[:starts_at].to_i)
+                expect(new_schedule.cadence[:duration]).to eq(new_dast_profile_schedule[:cadence].duration)
+                expect(new_schedule.cadence[:unit]).to eq(new_dast_profile_schedule[:cadence].unit)
+              end
+            end
+          end
+        end
+
         context 'when run_after_update=true' do
           let(:run_after_update) { true }