Why was it pulled before release?
Re:Rails API is coming to Rails 5
by steveklabnik on Tuesday April 21, 2015 @01:24PM
(#9415573)
It's been a very long time, so I don't remember the specifics, to be honest.
This gem was created because this feature was going to be in Rails a few years back, but was pulled out by DHH before release. But, as you can see, he's cool with it now.