rails/rails — comment on commit 992b3b5e065237986d6972e27fc109b05ab84e00
File:  line 0
By paul:

It is definitely more readable. In the gist, however, you can see that a single string interpolation takes ~ 0.5 usec, so its really not worth the readability cost anywhere except the hot path, where it might get called thousands of times. Reading a few hundred records from the DB and making AR objects out of them is one of those hot paths, though.