Validation failed Class must exist

Question

I have been (hours) trouble with associations in Rails. I found a lot of similar problems, but I couldn\'t apply for my case:

City\'s class:

class Ci         


        

Answer 1

Rails.application.config.active_record.belongs_to_required_by_default = false

This works because the Rails 5 has true by default to disable you go under Initilizers then click on the New_frame-work and turn the true to false