Merge branch 'issue-18032' into 'master'

Cache project build count. Closes #18032

See merge request !4377

CHANGELOG

@@ -28,6 +28,7 @@ v 8.9.0 (unreleased)
   - Make authentication service for Container Registry to be compatible with < Docker 1.11
   - Add Application Setting to configure Container Registry token expire delay (default 5min)
   - Cache assigned issue and merge request counts in sidebar nav
+  - Cache project build count in sidebar nav
 
 v 8.8.3
   - Fix incorrect links on pipeline page when merge request created from fork

app/models/ci/build.rb

@@ -313,6 +313,7 @@ module Ci
       build_data = Gitlab::BuildDataBuilder.build(self)
       project.execute_hooks(build_data.dup, :build_hooks)
       project.execute_services(build_data.dup, :build_hooks)
+      project.running_or_pending_build_count(force: true)
     end
 
     def artifacts?

app/models/project.rb

@@ -1011,4 +1011,10 @@ class Project < ActiveRecord::Base
 
     update_attribute(:pending_delete, true)
   end
+
+  def running_or_pending_build_count(force: false)
+    Rails.cache.fetch(['projects', id, 'running_or_pending_build_count'], force: force) do
+      builds.running_or_pending.count(:all)
+    end
+  end
 end

app/views/projects/pipelines/_head.html.haml

@@ -11,4 +11,4 @@
       = link_to project_builds_path(@project), title: 'Builds', class: 'shortcuts-builds' do
         %span
           Builds
-          %span.badge.count.builds_counter= number_with_delimiter(@project.builds.running_or_pending.count(:all))
+          %span.badge.count.builds_counter= number_with_delimiter(@project.running_or_pending_build_count)

features/project/builds/summary.feature

@@ -24,3 +24,4 @@ Feature: Project Builds Summary
     Then recent build has been erased
     And recent build summary does not have artifacts widget
     And recent build summary contains information saying that build has been erased
+    And the build count cache is updated

features/steps/project/builds/summary.rb

@@ -36,4 +36,8 @@ class Spinach::Features::ProjectBuildsSummary < Spinach::FeatureSteps
       expect(page).to have_content 'Build has been erased'
     end
   end
+
+  step 'the build count cache is updated' do
+    expect(@build.project.running_or_pending_build_count).to eq @build.project.builds.running_or_pending.count(:all)
+  end
 end