ActiveRecord::NestedAttributes::class_eval do

  def assign_nested_attributes_for_collection_association_with_preloading(association_name, *args)
    send(association_name).to_a
    assign_nested_attributes_for_collection_association_without_preloading(association_name, *args)
  end
  alias_method_chain :assign_nested_attributes_for_collection_association, :preloading

end