将这样的内容添加到environment.rb：

class AssertFailure < Exception
end

def assert(message = 'assertion Failed')
  unless block_given? and yield
    raise message
  end
end

并使其成为环境/ production.rb中的无操作,因此开销最小

def assert(message = 'assertion Failed')
end

然后,在您的代码中,您可以断言您内心的内容：

assert { value == expected_value }
assert('value was not what was expected') { value == expected_value }

如果value不等于expected_value并且您没有在生产中运行,则会引发异常.