This is excellent! Opened my eyes on usefulness of Vue.js. As someone vested in Rails for many years, I would love to see a parallel series on creating the same Trello Board application using React JS. That would be very useful for Rails developers.
Since upgrade to rails 5.1.5, the Rails.ajax call doesnt work anymore. No errors in log, nothing in the console, .. After a regression to 5.1.4 everything is working well, so this behaviour is due to the last rails version but I dont find where (I read the rails-ujs commits but found nothing, ...)