Preload correct latest test report for requirements

Preload correct latest test report for requirementes
on GraphQL look ahead.

Changelog: fixed

ee/app/graphql/resolvers/requirements_management/requirements_resolver.rb

@@ -37,8 +37,8 @@ module Resolvers
 
       def preloads
         {
-          last_test_report_manually_created: [:test_reports],
-          last_test_report_state: [:test_reports, { test_reports: [:build] }]
+          last_test_report_manually_created: [:recent_test_reports],
+          last_test_report_state: [:recent_test_reports, { recent_test_reports: [:build] }]
         }
       end
 

ee/app/models/requirements_management/requirement.rb

@@ -29,6 +29,7 @@ module RequirementsManagement
     validates :issue_id, uniqueness: true, allow_nil: true
 
     has_many :test_reports, inverse_of: :requirement
+    has_many :recent_test_reports, -> { order(created_at: :desc) }, class_name: 'TestReport', inverse_of: :requirement
 
     has_internal_id :iid, scope: :project
 
@@ -90,7 +91,7 @@ module RequirementsManagement
     end
 
     def latest_report
-      test_reports.last
+      recent_test_reports.first
     end
 
     def last_test_report_state

ee/spec/graphql/resolvers/requirements_management/requirements_resolver_spec.rb

@@ -42,6 +42,18 @@ RSpec.describe Resolvers::RequirementsManagement::RequirementsResolver do
         expect(resolve_requirements(iids: [requirement1.iid, requirement3.iid])).to contain_exactly(requirement1, requirement3)
       end
 
+      it 'preloads correct latest test report' do
+        requirement_2_latest_report = create(:test_report, requirement: requirement2, created_at: 1.hour.ago)
+        create(:test_report, requirement: requirement1, created_at: 2.hours.ago)
+        create(:test_report, requirement: requirement2, created_at: 4.hours.ago)
+        requirement_3_latest_report = create(:test_report, requirement: requirement3, created_at: 3.hours.ago)
+
+        requirements = resolve_requirements(sort: 'created_desc').to_a
+
+        expect(requirements[0].latest_report).to eq(requirement_2_latest_report)
+        expect(requirements[1].latest_report).to eq(requirement_3_latest_report)
+      end
+
       context 'when filtering by last test report state' do
         before do
           create(:test_report, state: :failed)

ee/spec/models/requirements_management/requirement_spec.rb

@@ -11,6 +11,8 @@ RSpec.describe RequirementsManagement::Requirement do
 
     it { is_expected.to belong_to(:author).class_name('User') }
     it { is_expected.to belong_to(:project) }
+    it { is_expected.to have_many(:test_reports) }
+    it { is_expected.to have_many(:recent_test_reports).order(created_at: :desc) }
 
     it_behaves_like 'a model with a requirement issue association'
   end