Then what is the new Rails?
You can't have Rails in Go.
I mean you can, but "go advocates", would crap on your work with an endless litany of articles about why whatever you wrote shouldn't be used because it's not the "go way". Remember Martini? That's right you don't.
Fortunately for Go, the biggest pain in the ass when it comes to web development is kind of a solved problem with the use of JSON support in SQL Dbs. All you have to do then is un-serialize directly from the DB, which helps getting rid of ORM when building object graphs.
I have no idea where all this salt comes from about go advocates, but there are plenty of Rails-likes in Go that are accepted and used by the community. Buffalo is probably the most Rails-ish (from a glance, I've not use Rails extensively), and it's maintained/advocated for by folks who have long been pillars of the community. Martini was effectively replaced by Gin (https://github.com/gin-gonic/gin), which is still heavily used.