Merge branch 'fix-latest-pipeine-ordering' into 'master'

Fix code that selects latest pipelines

Closes #25993 and #26031

See merge request !8286

app/models/ci/pipeline.rb

@@ -93,11 +93,8 @@ module Ci
         .select("max(#{quoted_table_name}.id)")
         .group(:ref, :sha)
 
-      if ref
-        where(id: max_id, ref: ref)
-      else
-        where(id: max_id)
-      end
+      relation = ref ? where(ref: ref) : self
+      relation.where(id: max_id).order(id: :desc)
     end
 
     def self.latest_status(ref = nil)

app/models/project.rb

@@ -418,7 +418,7 @@ class Project < ActiveRecord::Base
     repository.commit(ref)
   end
 
-  # ref can't be HEAD, can only be branch/tag name or SHA
+  # ref can't be HEAD or SHA, can only be branch/tag name
   def latest_successful_builds_for(ref = default_branch)
     latest_pipeline = pipelines.latest_successful_for(ref)
 

changelogs/unreleased/fix-latest-pipeine-ordering.yml

@@ -0,0 +1,4 @@
+---
+title: Fix finding the latest pipeline
+merge_request: 8286
+author:

spec/models/ci/pipeline_spec.rb

@@ -424,20 +424,18 @@ describe Ci::Pipeline, models: true do
     context 'when no ref is specified' do
       let(:pipelines) { described_class.latest.all }
 
-      it 'returns the latest pipeline for the same ref and different sha' do
-        expect(pipelines.map(&:sha)).to contain_exactly('A', 'B', 'C')
-        expect(pipelines.map(&:status)).
-          to contain_exactly('success', 'failed', 'skipped')
+      it 'gives the latest pipelines for the same ref and different sha in reverse chronological order' do
+        expect(pipelines.map(&:sha)).to eq(%w[C B A])
+        expect(pipelines.map(&:status)).to eq(%w[skipped failed success])
       end
     end
 
     context 'when ref is specified' do
       let(:pipelines) { described_class.latest('ref').all }
 
-      it 'returns the latest pipeline for ref and different sha' do
-        expect(pipelines.map(&:sha)).to contain_exactly('A', 'B')
-        expect(pipelines.map(&:status)).
-          to contain_exactly('success', 'failed')
+      it 'gives the latest pipelines for ref and different sha in reverse chronological order' do
+        expect(pipelines.map(&:sha)).to eq(%w[B A])
+        expect(pipelines.map(&:status)).to eq(%w[failed success])
       end
     end
   end