Introduce Pipeline#latest and Pipeline.latest_for:

So that we could easily access it for the view

app/models/ci/pipeline.rb

@@ -21,8 +21,12 @@ module Ci
     after_save :keep_around_commits
 
     # ref can't be HEAD or SHA, can only be branch/tag name
-    scope :latest_successful_for, ->(ref = default_branch) do
-      where(ref: ref).success.order(id: :desc).limit(1)
+    scope :latest_successful_for, ->(ref) do
+      latest(ref).success
+    end
+
+    scope :latest_for, ->(ref) do
+      where(ref: ref).order(id: :desc).limit(1)
     end
 
     def self.truncate_sha(sha)
@@ -98,6 +102,10 @@ module Ci
       end
     end
 
+    def latest
+      project.pipelines.latest_for(ref).first
+    end
+
     def latest?
       return false unless ref
       commit = project.commit(ref)

spec/models/ci/pipeline_spec.rb

 require 'spec_helper'
 
 describe Ci::Pipeline, models: true do
-  let(:project) { FactoryGirl.create :empty_project }
-  let(:pipeline) { FactoryGirl.create :ci_pipeline, project: project }
+  let(:project) { create(:empty_project) }
+  let(:pipeline) { create(:ci_pipeline, project: project) }
 
   it { is_expected.to belong_to(:project) }
   it { is_expected.to belong_to(:user) }
@@ -481,6 +481,50 @@ describe Ci::Pipeline, models: true do
     end
   end
 
+  context 'with non-empty project' do
+    let(:project) { create(:project) }
+    let(:pipeline) { create_pipeline }
+
+    describe '#latest?' do
+      context 'with latest sha' do
+        it 'returns true' do
+          expect(pipeline).to be_latest
+        end
+      end
+
+      context 'with not latest sha' do
+        before do
+          pipeline.update(
+            sha: project.commit("#{project.default_branch}~1").sha)
+        end
+
+        it 'returns false' do
+          expect(pipeline).not_to be_latest
+        end
+      end
+    end
+
+    describe '#latest' do
+      let(:previous_pipeline) { create_pipeline }
+
+      before do
+        previous_pipeline
+        pipeline
+      end
+
+      it 'gives the latest pipeline' do
+        expect(previous_pipeline.latest).to eq(pipeline)
+      end
+    end
+
+    def create_pipeline
+      create(:ci_pipeline,
+             project: project,
+             ref: project.default_branch,
+             sha: project.commit.sha)
+    end
+  end
+
   describe '#manual_actions' do
     subject { pipeline.manual_actions }