class RuboCop::Cop::Rails::FindBy

def on_send(node)
  return unless (recv_and_method = where_first(node))
  receiver, second_method = *recv_and_method
  range = Parser::Source::Range.new(node.source_range.source_buffer,
                                    receiver.loc.selector.begin_pos,
                                    node.loc.selector.end_pos)
  add_offense(node, range, format(MSG, second_method))
end