NoMethodError: undefined method `needs_migration?' for ActiveRecord::Migrator:Class

[RochelLevi]

This error is thrown immediately upon cloning and running learn due to the code in spec/spec_helper.rb line 8 and config.ru line 6. Students were able to move on after commenting out those methods, but the program would no longer throw a meaningful error if the migrations weren't run...

[marcelgalang]

I had a student with the same issue and found that ActiveRecord::Migrator:Class has been removed since Rails 5.1.

[AspenJames]

FIX: change Gemfile line 5 to gem 'activerecord', '4.2', :require => 'active_record'
Save and execute bundle update

[atxrenegade]

It's pretty frustrating as a student to find this error in at least five labs and see that this was raised 4 and half months ago and still not addressed.