Issues CSV avoids instantiating labels

app/views/projects/issues/index.csv.ruby

+labels = @issues.eager_load(:labels).
+                 pluck(:id, 'labels.title').
+                 inject(Hash.new([])) do |memo, (issue_id, label)|
+                   memo[issue_id] += [label]
+                   memo
+                 end
+
 columns = {
   'Issue ID' => 'iid',
   'Title' => 'title',
@@ -10,7 +17,7 @@ columns = {
   'Created At (UTC)' => -> (issue) { issue.created_at&.strftime('%Y-%m-%d %H:%M:%S') },
   'Updated At (UTC)' => -> (issue) { issue.updated_at&.strftime('%Y-%m-%d %H:%M:%S') },
   'Milestone' => -> (issue) { issue.milestone&.title },
-  'Labels' => -> (issue) { issue.labels_array.sort_by(&:title).map(&:title).join(',').presence },
+  'Labels' => -> (issue) { labels[issue.id].sort.join(',').presence }
 }
 
-CsvBuilder.new(columns).render(@issues.includes(:author, :assignee, :labels))
+CsvBuilder.new(columns).render(@issues.includes(:author, :assignee))