I’m assuming RoR is Ruby on Rails here? If so, this seems extremely odd considering the age of the two things.
A casual google shows this including a poll in 2014: https://www.sitepoint.com/editor-rubyists-use/
There's even a quora question too: https://www.quora.com/Why-do-so-many-Rubyists-use-VI-M
And a plausible answer "Why rubyists went with vim over emacs could stem from the popular rails.vim plugin from Tim Pope."