Fix commit latest pipeline status with child pipeline

app/models/ci/pipeline.rb

@@ -394,26 +394,13 @@ module Ci
     #       given we simply get the latest pipelines for the commits, regardless
     #       of what refs the pipelines belong to.
     def self.latest_pipeline_per_commit(commits, ref = nil)
-      p1 = arel_table
-      p2 = arel_table.alias
+      sql = select('DISTINCT ON (sha) *')
+              .where(sha: commits)
+              .order(:sha, id: :desc)
 
-      # This LEFT JOIN will filter out all but the newest row for every
-      # combination of (project_id, sha) or (project_id, sha, ref) if a ref is
-      # given.
-      cond = p1[:sha].eq(p2[:sha])
-        .and(p1[:project_id].eq(p2[:project_id]))
-        .and(p1[:id].lt(p2[:id]))
+      sql = sql.where(ref: ref) if ref
 
-      cond = cond.and(p1[:ref].eq(p2[:ref])) if ref
-      join = p1.join(p2, Arel::Nodes::OuterJoin).on(cond)
-
-      relation = where(sha: commits)
-        .where(p2[:id].eq(nil))
-        .joins(join.join_sources)
-
-      relation = relation.where(ref: ref) if ref
-
-      relation.each_with_object({}) do |pipeline, hash|
+      sql.each_with_object({}) do |pipeline, hash|
         hash[pipeline.sha] = pipeline
       end
     end

changelogs/unreleased/fix-commit-status-with-child-pipeline.yml

+---
+title: Filter out pipelines that were excluded in the relation scope in Ci::Pipeline#latest_pipeline_per_commit
+merge_request: 55657
+author: Cong Chen @gentcys
+type: fixed

spec/models/ci/pipeline_spec.rb

@@ -2282,6 +2282,35 @@ RSpec.describe Ci::Pipeline, :mailer, factory_default: :keep do
         )
       end
     end
+
+    context 'when method is scoped' do
+      let!(:commit_123_ref_master_parent_pipeline) do
+        create(
+          :ci_pipeline,
+          sha: '123',
+          ref: 'master',
+          project: project
+        )
+      end
+
+      let!(:commit_123_ref_master_child_pipeline) do
+        create(
+          :ci_pipeline,
+          sha: '123',
+          ref: 'master',
+          project: project,
+          child_of: commit_123_ref_master_parent_pipeline
+        )
+      end
+
+      it 'returns the latest pipeline after applying the scope' do
+        result = described_class.ci_sources.latest_pipeline_per_commit(%w[123], 'master')
+
+        expect(result).to match(
+          '123' => commit_123_ref_master_parent_pipeline
+        )
+      end
+    end
   end
 
   describe '.latest_successful_ids_per_project' do