dblock

class Capybara::Session
  def wait_until(timeout = Capybara.default_wait_time)
    Timeout.timeout(timeout) do
      sleep(0.1) until value = yield
      value
    end
  end
end

rtomayko

def defer(&block)
  def block.each ; yield call ; end
  block
end

app =
  lambda do |env|
    status = 200
    headers = { 'Last-Modified' => exec_sql('SELECT MAX(updated_at) FROM foos').httpdate }