Merge branch 'sh-fix-events-nplus-one' into 'master'

Eliminate N+1 queries with authors and push_data_payload in Events API

See merge request gitlab-org/gitlab-ce!19347

changelogs/unreleased/sh-fix-events-nplus-one.yml

+---
+title: Eliminate N+1 queries with authors and push_data_payload in Events API
+merge_request:
+author:
+type: performance

lib/api/events.rb

@@ -17,6 +17,7 @@ module API
 
       def present_events(events)
         events = events.reorder(created_at: params[:sort])
+                 .with_associations
 
         present paginate(events), with: Entities::Event
       end

spec/requests/api/events_spec.rb

@@ -176,7 +176,7 @@ describe API::Events do
       end
 
       it 'avoids N+1 queries' do
-        control_count = ActiveRecord::QueryRecorder.new do
+        control_count = ActiveRecord::QueryRecorder.new(skip_cached: false) do
           get api("/projects/#{private_project.id}/events", user), target_type: :merge_request
         end.count
 
@@ -184,7 +184,7 @@ describe API::Events do
 
         expect do
           get api("/projects/#{private_project.id}/events", user), target_type: :merge_request
-        end.not_to exceed_query_limit(control_count)
+        end.not_to exceed_all_query_limit(control_count)
 
         expect(response).to have_gitlab_http_status(200)
         expect(response).to include_pagination_headers