Merge branch 'zj-deployment-status-on-mr' into 'master'

Show deployment status on a MR view

## What are the relevant issue numbers?

Resolves #19571, one in the list of #19992

## Screenshots (if relevant)

external_url = nil
![Screen_Shot_2016-08-02_at_13.57.03](/uploads/20ea1587eea556c7a1acd0ff726a5bfb/Screen_Shot_2016-08-02_at_13.57.03.png)

external_url != nil
![Screen_Shot_2016-08-02_at_13.59.59](/uploads/0094b9ddece3f4bf76c83988840c096d/Screen_Shot_2016-08-02_at_13.59.59.png)

Note, the timings are weird between merging and deploying, that is because I did it in the wrong order.

## Does this MR meet the acceptance criteria?

- [X] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing

See merge request !5622

3 files changed, 20 insertions, 0 deletions

diff --git a/app/models/deployment.rb b/app/models/deployment.rb
index 1a7cd60817e..1e338889714 100644
--- a/app/models/deployment.rb
+++ b/app/models/deployment.rb
@@ -36,4 +36,10 @@ class Deployment < ActiveRecord::Base
   def manual_actions
     deployable.try(:other_actions)
   end
+
+  def includes_commit?(commit)
+    return false unless commit
+
+    project.repository.is_ancestor?(commit.id, sha)
+  end
 end
diff --git a/app/models/environment.rb b/app/models/environment.rb
index baed106e8c8..75e6f869786 100644
--- a/app/models/environment.rb
+++ b/app/models/environment.rb
@@ -25,4 +25,10 @@ class Environment < ActiveRecord::Base
   def nullify_external_url
     self.external_url = nil if self.external_url.blank?
   end
+
+  def includes_commit?(commit)
+    return false unless last_deployment
+
+    last_deployment.includes_commit?(commit)
+  end
 end
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index f6d0d0c98f5..fe799382fd0 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -591,6 +591,14 @@ class MergeRequest < ActiveRecord::Base
     !pipeline || pipeline.success?
   end
 
+  def environments
+    return unless diff_head_commit
+
+    target_project.environments.select do |environment|
+      environment.includes_commit?(diff_head_commit)
+    end
+  end
+
   def state_human_name
     if merged?
       "Merged"