Create new Ci::BuildNeeds when retrying builds

Change needs in CLONE_ACCESSORS to needs_attributes
because it was reassigning the needs relationship
to the new build.

app/models/ci/processable.rb

@@ -90,6 +90,12 @@ module Ci
       end
     end
 
+    def needs_attributes
+      strong_memoize(:needs_attributes) do
+        needs.map { |need| need.attributes.except('id', 'build_id') }
+      end
+    end
+
     private
 
     def validate_scheduling_type?

app/services/ci/retry_build_service.rb

@@ -5,7 +5,8 @@ module Ci
     CLONE_ACCESSORS = %i[pipeline project ref tag options name
                          allow_failure stage stage_id stage_idx trigger_request
                          yaml_variables when environment coverage_regex
-                         description tag_list protected needs resource_group scheduling_type].freeze
+                         description tag_list protected needs_attributes
+                         resource_group scheduling_type].freeze
 
     def execute(build)
       reprocess!(build).tap do |new_build|

changelogs/unreleased/207536-retried-jobs-are-not-able-to-find-knapsack-report.yml

+---
+title: Keep needs association on the retried build
+merge_request: 25888
+author:
+type: fixed

spec/models/ci/processable_spec.rb

@@ -145,4 +145,28 @@ describe Ci::Processable do
       expect(another_build.reload.scheduling_type).to be_nil
     end
   end
+
+  describe '#needs_attributes' do
+    let(:build) { create(:ci_build, :created, project: project, pipeline: pipeline) }
+
+    context 'with needs' do
+      before do
+        create(:ci_build_need, build: build, name: 'test1')
+        create(:ci_build_need, build: build, name: 'test2')
+      end
+
+      it 'returns all needs attributes' do
+        expect(build.needs_attributes).to contain_exactly(
+          { 'artifacts' => true, 'name' => 'test1' },
+          { 'artifacts' => true, 'name' => 'test2' }
+        )
+      end
+    end
+
+    context 'without needs' do
+      it 'returns all needs attributes' do
+        expect(build.needs_attributes).to be_empty
+      end
+    end
+  end
 end

spec/services/ci/retry_build_service_spec.rb

@@ -36,7 +36,7 @@ describe Ci::RetryBuildService do
        job_artifacts_performance job_artifacts_lsif
        job_artifacts_codequality job_artifacts_metrics scheduled_at
        job_variables waiting_for_resource_at job_artifacts_metrics_referee
-       job_artifacts_network_referee].freeze
+       job_artifacts_network_referee needs].freeze
 
   IGNORE_ACCESSORS =
     %i[type lock_version target_url base_tags trace_sections
@@ -46,7 +46,8 @@ describe Ci::RetryBuildService do
        sourced_pipelines artifacts_file_store artifacts_metadata_store
        metadata runner_session trace_chunks upstream_pipeline_id
        artifacts_file artifacts_metadata artifacts_size commands
-       resource resource_group_id processed security_scans].freeze
+       resource resource_group_id processed security_scans author
+       pipeline_id].freeze
 
   shared_examples 'build duplication' do
     let(:another_pipeline) { create(:ci_empty_pipeline, project: project) }
@@ -79,8 +80,15 @@ describe Ci::RetryBuildService do
     end
 
     describe 'clone accessors' do
+      let(:forbidden_associations) do
+        Ci::Build.reflect_on_all_associations.each_with_object(Set.new) do |assoc, memo|
+          memo << assoc.name unless assoc.macro == :belongs_to
+        end
+      end
+
       CLONE_ACCESSORS.each do |attribute|
         it "clones #{attribute} build attribute" do
+          expect(attribute).not_to be_in(forbidden_associations), "association #{attribute} must be `belongs_to`"
           expect(build.send(attribute)).not_to be_nil
           expect(new_build.send(attribute)).not_to be_nil
           expect(new_build.send(attribute)).to eq build.send(attribute)
@@ -97,9 +105,17 @@ describe Ci::RetryBuildService do
           expect(new_build.protected).to eq build.protected
         end
       end
+
+      it 'clones only the needs attributes' do
+        expect(new_build.needs.exists?).to be_truthy
+        expect(build.needs.exists?).to be_truthy
+
+        expect(new_build.needs_attributes).to match(build.needs_attributes)
+        expect(new_build.needs).not_to match(build.needs)
+      end
     end
 
-    describe 'reject acessors' do
+    describe 'reject accessors' do
       REJECT_ACCESSORS.each do |attribute|
         it "does not clone #{attribute} build attribute" do
           expect(new_build.send(attribute)).not_to eq build.send(attribute)
@@ -117,8 +133,9 @@ describe Ci::RetryBuildService do
       #
       current_accessors =
         Ci::Build.attribute_names.map(&:to_sym) +
+        Ci::Build.attribute_aliases.keys.map(&:to_sym) +
         Ci::Build.reflect_on_all_associations.map(&:name) +
-        [:tag_list]
+        [:tag_list, :needs_attributes]
 
       current_accessors.uniq!