Merge branch 'master' into 'gl-ui-loading-icon'gl-ui-loading-icon

# Conflicts:
#   app/assets/javascripts/jobs/components/job_app.vue

1 files changed, 18 insertions, 5 deletions

diff --git a/app/models/ci/pipeline.rb b/app/models/ci/pipeline.rb
index aeee7f0a5d2..56010e899a4 100644
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -181,22 +181,31 @@ module Ci
     #
     # ref - The name (or names) of the branch(es)/tag(s) to limit the list of
     #       pipelines to.
-    def self.newest_first(ref = nil)
+    # limit - This limits a backlog search, default to 100.
+    def self.newest_first(ref: nil, limit: 100)
       relation = order(id: :desc)
+      relation = relation.where(ref: ref) if ref
+
+      if limit
+        ids = relation.limit(limit).select(:id)
+        # MySQL does not support limit in subquery
+        ids = ids.pluck(:id) if Gitlab::Database.mysql?
+        relation = relation.where(id: ids)
+      end
 
-      ref ? relation.where(ref: ref) : relation
+      relation
     end
 
     def self.latest_status(ref = nil)
-      newest_first(ref).pluck(:status).first
+      newest_first(ref: ref).pluck(:status).first
     end
 
     def self.latest_successful_for(ref)
-      newest_first(ref).success.take
+      newest_first(ref: ref).success.take
     end
 
     def self.latest_successful_for_refs(refs)
-      relation = newest_first(refs).success
+      relation = newest_first(ref: refs).success
 
       relation.each_with_object({}) do |pipeline, hash|
         hash[pipeline.ref] ||= pipeline
@@ -238,6 +247,10 @@ module Ci
       end
     end
 
+    def self.latest_successful_ids_per_project
+      success.group(:project_id).select('max(id) as id')
+    end
+
     def self.truncate_sha(sha)
       sha[0...8]
     end