Add Timeless helper module to prevent updated_at from being updated

app/models/merge_request.rb

@@ -85,12 +85,7 @@ class MergeRequest < ActiveRecord::Base
     state :cannot_be_merged
 
     around_transition do |merge_request, transition, block|
-      merge_request.record_timestamps = false
-      begin
-        block.call
-      ensure
-        merge_request.record_timestamps = true
-      end
+      Gitlab::Timeless.timeless(merge_request, &block)
     end
   end
 

lib/gitlab/timeless.rb

+module Gitlab
+  module Timeless
+    def self.timeless(model, &block)
+      original_record_timestamps = model.record_timestamps
+      model.record_timestamps = false
+
+      if block.arity.abs == 1
+        block.call(model)
+      else
+        block.call
+      end
+    ensure
+      model.record_timestamps = original_record_timestamps
+    end
+  end
+end