访问Rescue Block中的错误消息

Question

有没有办法在救援块中以字符串形式访问错误消息？例如：

def foo
  raise RuntimeError, "This is an error"
end

def bar
  begin
    foo
  rescue RuntimeError
    puts "Rescued"
  end
end

bar

有没有办法从救援区获取"This is an error"？像这样：

...
rescue RuntimeError
    puts <error-message>
end
...

Answer 1

您需要指定一个变量来存储错误

def foo
  raise RuntimeError, "This is an error"
end

def bar
  begin
    foo
  rescue RuntimeError => ex
    puts "Rescued #{ex.message}"
  end
end