“Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.”
Seeing the recent evolutions, I thought Rails people learned that magic in code leads to debugging unhappiness.
We tend to look at macros as dangerous, but this is a pretty clean usage of macros, it's basically a function that turns the arguments into a string. Simple and easy to debug. Don't you think?
Edit: Discussion about that quote: http://stackoverflow.com/questions/1103299/help-me-understan...
Especially since without the macro you’d just need to write two characters more or, even better, a clearly named constant, like kNSRAllProperties.