RuntimeError: can't modify frozen Array when running rspec in rails 5.1

Question

I recently upgraded to Rails 5.1 from v4.3 and am now getting this error when running tests:

An error occurred while loading 

./spec/controllers/admin/capac         


        

Answer 1

My two-cents, as it may help someone else. I had this same issue when upgrading rails 4.2 to 5.0 I saw a thread post somewhere that suggested running one spec-test by itself / at a time. When I did that, I got a different error: superclass must be a Class and pointed me to my new .../models/application_record.rb file, in which I had made a syntax error by omission:

class ApplicationRecord < ActiveRecord                              
  self.abstract_class = true
end

The above is missing ::Base after ActiveRecord -- first line.

class ApplicationRecord < ActiveRecord::Base                                
  self.abstract_class = true
end

Adding that back in fixed all my specs.