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app/serializers/group_child_entity.rb

@@ -114,16 +114,35 @@ def can_edit?
   end
 
   def last_pipeline
-    return unless object.builds_enabled? && pipeline = object.pipeline_status
-    return unless pipeline.status.present?
-
-    {
-      details_path: project_pipeline_path(object, pipeline),
-      group: pipeline.status,
-      icon: "status_#{pipeline.status}",
-      label: pipeline.status,
-      text: pipeline.status
-    }
+    return unless project? && can?(request.current_user, :read_build, object)
+
+    BatchLoader.for(object).batch do |projects, loader|
+      # rubocop: disable CodeReuse/ActiveRecord
+      # This will load the project_feature association for all the projects for the line after next line
+      ActiveRecord::Associations::Preloader.new.preload(projects, :project_feature)
+      builds_enabled_projects = projects.select(&:builds_enabled?)
+      # Prefill nil for all the projects
+      projects.each { |project| loader.call(project, nil) }
+
+      # This is to load last_pipeline for all the builds-enabled projects in one SQL
+      Ci::Pipeline # The DISTINCT select statement will work with the below ORDER statement to return the last pipeline
+        .select("DISTINCT ON (project_id) *")
+        .where(project_id: builds_enabled_projects.map(&:id)).ci_sources
+        .order(:project_id, id: :desc)
+        # `each` is used instead of `find_each` because `find_each` will overwrite the above ORDER statement that we
+        # need for the last pipelines query to work.
+        .each do |pipeline|
+        project = projects.find { |project| project.id == pipeline.project_id }
+        loader.call(project, {
+                      details_path: project_pipeline_path(project, pipeline),
+                      group: pipeline.status,
+                      icon: "status_#{pipeline.status}",
+                      label: pipeline.status,
+                      text: pipeline.status
+                    })
+      end
+      # rubocop: enable CodeReuse/ActiveRecord
+    end
   end
 end