Merge branch '21444-pipeliens-new-mr' into 'master'

Add pipelines tab to new MR

#### What does this MR do?
Adds pipelines tab to new MRs

#### Screenshots (if relevant)
![Screen_Shot_2016-10-10_at_10.23.27_AM](/uploads/6c3f8f2be0cf9ba7cc78f6d918307ec0/Screen_Shot_2016-10-10_at_10.23.27_AM.png)
![Screen_Shot_2016-10-11_at_8.59.45_AM](/uploads/e67577d92327eafef6f04073f3d94212/Screen_Shot_2016-10-11_at_8.59.45_AM.png)

#### What are the relevant issue numbers?
Closes #21444

See merge request !6238

app/controllers/projects/merge_requests_controller.rb

@@ -489,13 +489,12 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     @noteable = @merge_request
     @commits_count = @merge_request.commits.count
 
-    @pipeline = @merge_request.pipeline
-    @statuses = @pipeline.statuses.relevant if @pipeline
-
     if @merge_request.locked_long_ago?
       @merge_request.unlock_mr
       @merge_request.close
     end
+
+    define_pipelines_vars
   end
 
   # Discussion tab data is rendered on html responses of actions
@@ -523,7 +522,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
 
   def define_widget_vars
     @pipeline = @merge_request.pipeline
-    @pipelines = [@pipeline].compact
   end
 
   def define_commit_vars
@@ -550,6 +548,15 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     )
   end
 
+  def define_pipelines_vars
+    @pipelines = @merge_request.all_pipelines
+
+    if @pipelines.any?
+      @pipeline = @pipelines.first
+      @statuses = @pipeline.statuses.relevant
+    end
+  end
+
   def define_new_vars
     @noteable = @merge_request
 
@@ -565,10 +572,10 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     @commit = @merge_request.diff_head_commit
     @base_commit = @merge_request.diff_base_commit
 
-    @pipeline = @merge_request.pipeline
-    @statuses = @pipeline.statuses.relevant if @pipeline
     @note_counts = Note.where(commit_id: @commits.map(&:id)).
       group(:commit_id).count
+
+    define_pipelines_vars
   end
 
   def invalid_mr

app/models/merge_request.rb

@@ -787,21 +787,21 @@ class MergeRequest < ActiveRecord::Base
   def all_pipelines
     return unless source_project
 
-    @all_pipelines ||= begin
-      sha = if persisted?
-              all_commits_sha
-            else
-              diff_head_sha
-            end
-
-      source_project.pipelines.order(id: :desc).
-        where(sha: sha, ref: source_branch)
-    end
+    @all_pipelines ||= source_project.pipelines
+      .where(sha: all_commits_sha, ref: source_branch)
+      .order(id: :desc)
   end
 
   # Note that this could also return SHA from now dangling commits
+  #
   def all_commits_sha
+    if persisted?
       merge_request_diffs.flat_map(&:commits_sha).uniq
+    elsif compare_commits
+      compare_commits.to_a.reverse.map(&:id)
+    else
+      [diff_head_sha]
+    end
   end
 
   def merge_commit

app/views/projects/merge_requests/_new_submit.html.haml

@@ -29,7 +29,11 @@
         = link_to url_for(params), data: {target: 'div#commits', action: 'new', toggle: 'tab'} do
           Commits
           %span.badge= @commits.size
-      - if @pipeline
+      - if @pipelines.any?
+        %li.builds-tab
+          = link_to url_for(params), data: {target: 'div#pipelines', action: 'pipelines', toggle: 'tab'} do
+            Pipelines
+            %span.badge= @pipelines.size
         %li.builds-tab
           = link_to url_for(params), data: {target: 'div#builds', action: 'builds', toggle: 'tab'} do
             Builds
@@ -44,9 +48,11 @@
         = render "projects/merge_requests/show/commits"
       #diffs.diffs.tab-pane
         - # This tab is always loaded via AJAX
-      - if @pipeline
+      - if @pipelines.any?
         #builds.builds.tab-pane
           = render "projects/merge_requests/show/builds"
+        #pipelines.pipelines.tab-pane
+          = render "projects/merge_requests/show/pipelines"
 
   .mr-loading-status
     = spinner
@@ -59,5 +65,5 @@
 :javascript
   var merge_request = new MergeRequest({
     action: "#{(@show_changes_tab ? 'new/diffs' : 'new')}",
-    buildsLoaded: "#{@pipeline ? 'true' : 'false'}"
+    buildsLoaded: "#{@pipelines.any? ? 'true' : 'false'}"
   });

app/views/projects/merge_requests/_show.html.haml

@@ -61,7 +61,7 @@
           %li.pipelines-tab
             = link_to pipelines_namespace_project_merge_request_path(@project.namespace, @project, @merge_request), data: { target: '#pipelines', action: 'pipelines', toggle: 'tab' } do
               Pipelines
-              %span.badge= @merge_request.all_pipelines.size
+              %span.badge= @pipelines.size
           %li.builds-tab
             = link_to builds_namespace_project_merge_request_path(@project.namespace, @project, @merge_request), data: { target: '#builds', action: 'builds', toggle: 'tab' } do
               Builds

spec/models/merge_request_spec.rb

@@ -640,6 +640,7 @@ describe MergeRequest, models: true do
   end
 
   describe '#all_commits_sha' do
+    context 'when merge request is persisted' do
       let(:all_commits_sha) do
         subject.merge_request_diffs.flat_map(&:commits).map(&:sha).uniq
       end
@@ -669,6 +670,29 @@ describe MergeRequest, models: true do
       end
     end
 
+    context 'when merge request is not persisted' do
+      context 'when compare commits are set in the service' do
+        let(:commit) { spy('commit') }
+
+        subject do
+          build(:merge_request, compare_commits: [commit, commit])
+        end
+
+        it 'returns commits from compare commits temporary data' do
+          expect(subject.all_commits_sha).to eq [commit, commit]
+        end
+      end
+
+      context 'when compare commits are not set in the service' do
+        subject { build(:merge_request) }
+
+        it 'returns array with diff head sha element only' do
+          expect(subject.all_commits_sha).to eq [subject.diff_head_sha]
+        end
+      end
+    end
+  end
+
   describe '#participants' do
     let(:project) { create(:project, :public) }