Extract Ci::Build#report_artifacts into method

Extracts combining the job_artifacts relation with the with_reports
scope for getting report artifacts into a method.

app/models/ci/build.rb

@@ -765,6 +765,10 @@ module Ci
       end
     end
+    def report_artifacts
+      job_artifacts.with_reports
+    end
+
     # Virtual deployment status depending on the environment status.
     def deployment_status
       return unless starts_environment?

app/serializers/build_details_entity.rb

@@ -42,9 +42,10 @@ class BuildDetailsEntity < JobEntity
     end
   end
-  expose :reports, if: -> (*) { can?(current_user, :read_build, build) }, using: JobArtifactReportEntity do |build|
-    build.job_artifacts.with_reports
-  end
+  expose :report_artifacts,
+    as: :reports,
+    using: JobArtifactReportEntity,
+    if: -> (*) { can?(current_user, :read_build, build) }
   expose :erased_by, if: -> (*) { build.erased? }, using: UserEntity
   expose :erase_path, if: -> (*) { build.erasable? && can?(current_user, :erase_build, build) } do |build|

spec/models/ci/build_spec.rb

@@ -3490,6 +3490,18 @@ describe Ci::Build do
     end
   end
+  describe '#report_artifacts' do
+    subject { build.report_artifacts }
+
+    context 'when the build has reports' do
+      let!(:report) { create(:ci_job_artifact, :codequality, job: build) }
+
+      it 'returns the artifacts with reports' do
+        expect(subject).to contain_exactly(report)
+      end
+    end
+  end
+
   describe '#artifacts_metadata_entry' do
     set(:build) { create(:ci_build, project: project) }
     let(:path) { 'other_artifacts_0.1.2/another-subdirectory/banana_sample.gif' }

spec/serializers/build_details_entity_spec.rb

@@ -151,7 +151,8 @@ describe BuildDetailsEntity do
       let!(:report) { create(:ci_job_artifact, :codequality, job: build) }
       it 'exposes the report artifacts' do
-        expect(subject[:reports]).not_to be_empty
+        expect(subject[:reports].count).to eq(1)
+        expect(subject[:reports].first[:file_type]).to eq('codequality')
       end
     end
   end