Merge branch 'fix-stage-status-show-for-pipelines' into 'master'

Fix stage status shown for pipelines

## What does this MR do?
Properly calculates a status of stage when shown on a list of pipelines

## Why was this MR needed?
Previously we were calculating a status for all builds, including retried ones. 
This were affecting a overall stage status when a build were retried.

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18896 https://gitlab.com/gitlab-org/gitlab-ce/issues/18150

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5277

CHANGELOG

@@ -63,6 +63,7 @@ v 8.10.0 (unreleased)
   - Fix mentioned users list on diff notes
   - Check for conflicts with existing Project's wiki path when creating a new project.
   - Show last push widget in upstream after push to fork
+  - Fix stage status shown for pipelines
   - Cache todos pending/done dashboard query counts.
   - Don't instantiate a git tree on Projects show default view
   - Bump Rinku to 2.0.0

app/views/projects/ci/pipelines/_pipeline.html.haml

@@ -32,7 +32,7 @@
           Cant find HEAD commit for this branch
 
 
-    - stages_status = pipeline.statuses.stages_status
+    - stages_status = pipeline.statuses.latest.stages_status
     - stages.each do |stage|
       %td
         - status = stages_status[stage]

spec/models/commit_status_spec.rb

@@ -177,10 +177,10 @@ describe CommitStatus, models: true do
 
   describe '#stages' do
     before do
-      FactoryGirl.create :commit_status, pipeline: pipeline, stage: 'build', stage_idx: 0, status: 'success'
-      FactoryGirl.create :commit_status, pipeline: pipeline, stage: 'build', stage_idx: 0, status: 'failed'
-      FactoryGirl.create :commit_status, pipeline: pipeline, stage: 'deploy', stage_idx: 2, status: 'running'
-      FactoryGirl.create :commit_status, pipeline: pipeline, stage: 'test', stage_idx: 1, status: 'success'
+      create :commit_status, pipeline: pipeline, stage: 'build', name: 'linux', stage_idx: 0, status: 'success'
+      create :commit_status, pipeline: pipeline, stage: 'build', name: 'mac', stage_idx: 0, status: 'failed'
+      create :commit_status, pipeline: pipeline, stage: 'deploy', name: 'staging', stage_idx: 2, status: 'running'
+      create :commit_status, pipeline: pipeline, stage: 'test', name: 'rspec', stage_idx: 1, status: 'success'
     end
 
     context 'stages list' do
@@ -192,7 +192,7 @@ describe CommitStatus, models: true do
     end
 
     context 'stages with statuses' do
-      subject { CommitStatus.where(pipeline: pipeline).stages_status }
+      subject { CommitStatus.where(pipeline: pipeline).latest.stages_status }
 
       it 'return list of stages with statuses' do
         is_expected.to eq({
@@ -201,6 +201,20 @@ describe CommitStatus, models: true do
           'deploy' => 'running'
         })
       end
+
+      context 'when build is retried' do
+        before do
+          create :commit_status, pipeline: pipeline, stage: 'build', name: 'mac', stage_idx: 0, status: 'success'
+        end
+
+        it 'ignores a previous state' do
+          is_expected.to eq({
+            'build' => 'success',
+            'test' => 'success',
+            'deploy' => 'running'
+          })
+        end
+      end
     end
   end