1 files changed, 24 insertions, 0 deletions
diff --git a/app/models/concerns/bulk_users_by_email_load.rb b/app/models/concerns/bulk_users_by_email_load.rb
new file mode 100644
index 00000000000..edbd3e21458
--- /dev/null
+++ b/app/models/concerns/bulk_users_by_email_load.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+module BulkUsersByEmailLoad
+  extend ActiveSupport::Concern
+
+  included do
+    def users_by_emails(emails)
+      Gitlab::SafeRequestLoader.execute(resource_key: user_by_email_resource_key, resource_ids: emails) do |emails|
+        # have to consider all emails - even secondary, so use all_emails here
+        grouped_users_by_email = User.by_any_email(emails).preload(:emails).group_by(&:all_emails)
+
+        grouped_users_by_email.each_with_object({}) do |(found_emails, users), h|
+          found_emails.each { |e| h[e] = users.first if emails.include?(e) } # don't include all emails for an account, only the ones we want
+        end
+      end
+    end
+
+    private
+
+    def user_by_email_resource_key
+      "user_by_email_for_#{User.name.underscore.pluralize}:#{self.class}:#{self.id}"
+    end
+  end
+end