Load commit in batches for pipelines#index

Uses `list_commits_by_oid` on the CommitService, to request the needed
commits for pipelines. These commits are needed to display the user that
created the commit and the commit title.

This includes fixes for tests failing that depended on the commit
being `nil`. However, now these are batch loaded, this doesn't happen
anymore and the commits are an instance of BatchLoader.

1 files changed, 7 insertions, 6 deletions

diff --git a/app/models/ci/pipeline.rb b/app/models/ci/pipeline.rb
index 28f154581a9..d4690da3be6 100644
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -287,8 +287,12 @@ module Ci
       Ci::Pipeline.truncate_sha(sha)
     end
 
+    # NOTE: This is loaded lazily and will never be nil, even if the commit
+    # cannot be found.
+    #
+    # Use constructs like: `pipeline.commit.present?`
     def commit
-      @commit ||= project.commit_by(oid: sha)
+      @commit ||= Commit.lazy(project, sha)
     end
 
     def branch?
@@ -338,12 +342,9 @@ module Ci
     end
 
     def latest?
-      return false unless ref
-
-      commit = project.commit(ref)
-      return false unless commit
+      return false unless ref && commit.present?
 
-      commit.sha == sha
+      project.commit(ref) == commit
     end
 
     def retried