1 files changed, 29 insertions, 0 deletions
diff --git a/rubocop/cop/performance/active_record_subtransaction_methods.rb b/rubocop/cop/performance/active_record_subtransaction_methods.rb
new file mode 100644
index 00000000000..3b89d3ab858
--- /dev/null
+++ b/rubocop/cop/performance/active_record_subtransaction_methods.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module Performance
+      # Cop that disallows certain methods that rely on subtransactions in their implementation.
+      # Companion to Performance/ActiveRecordSubtransactions, which bans direct usage of subtransactions.
+      class ActiveRecordSubtransactionMethods < RuboCop::Cop::Cop
+        MSG = 'Methods that rely on subtransactions should not be used. ' \
+          'For more information see: https://gitlab.com/gitlab-org/gitlab/-/issues/338346'
+
+        DISALLOWED_METHODS = %i[
+          safe_ensure_unique
+          safe_find_or_create_by
+          safe_find_or_create_by!
+          with_fast_read_statement_timeout
+          create_or_find_by
+          create_or_find_by!
+        ].to_set.freeze
+
+        def on_send(node)
+          return unless DISALLOWED_METHODS.include?(node.method_name)
+
+          add_offense(node, location: :selector)
+        end
+      end
+    end
+  end
+end