Jan E. wrote in post #1064399:
> bill gate wrote in post #1064388:
>> Why lot of Rails snippet code  use __FILE__ __LINE__
>
> __FILE__ and __LINE__ are magic constants. They point to the file/line
> they're in.
>
> In combination with class_eval these constants can be used to produce
> exact error messages. If you don't use them, an error message within the
> class_eval will only display the file and line of the "class_eval".
>
> See
> http://ruby-doc.org/core-1.9.3/Module.html#method-i-class_eval

Greate, Thank you.

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