为什么包含Rescuable模块不起作用？

Question

class MyKlass 

    include ActiveSupport::Rescuable 

    rescue_from Exception do 
    return "rescued" 
    end 

    #other stuff 
end 

MyKlass是纯ruby对象，但在Rails应用程序中定义。

如果我尝试在rails控制台中调用MyKlass实例，然后将其应用于该方法，该方法肯定应该引发异常，除了预期将被解救的错误之外，没有任何事情发生。

Answer 1

下面是它应该如何使用：

class MyKlass 
    include ActiveSupport::Rescuable 
    # define a method, which will do something for you, when exception is caught 
    rescue_from Exception, with: :my_rescue 

    def some_method(&block) 
    yield 
    rescue Exception => exception 
    rescue_with_handler(exception) || raise 
    end 

    # do whatever you want with exception, for example, write it to logs 
    def my_rescue(exception) 
    puts "Exception catched! #{exception.class}: #{exception.message}" 
    end 
end 

MyKlass.new.some_method { 0/0 } 
# Exception catched! ZeroDivisionError: divided by 0 
#=> true 

不言而喻，即抢救Exception是一种犯罪行为。