uninitialized constant ActiveRecord::Railtie::ActiveRecord-CodePudding

While upgrading from Ruby 2.6.6 to Ruby 3.1.3 and from Rails 5.2.6 to Rails 6.0.6, I made sure that I followed and incorporated all the changes between these 2 rails versions. I am not sure why I am getting the following error.

mw@2981eebea820:/workspaces/mw$ bundle exec rspec spec
DEPRECATION WARNING: Logger don't need to call #after_initialize directly anymore. It will be deprecated without replacement in Rails 6.1. (called from new at /workspaces/mw/config/application.rb:53)

An error occurred while loading ./spec/controllers/basic_controller_spec.rb.
Failure/Error: require 'rspec/rails'

NameError:
  uninitialized constant ActiveRecord::Railtie::ActiveRecord

          include ActiveRecord::Railties::ControllerRuntime
                  ^^^^^^^^^^^^
# /usr/local/bundle/gems/activerecord-6.0.6/lib/active_record/railtie.rb:209:in `block (2 levels) in <class:Railtie>'
# /usr/local/bundle/gems/activesupport-6.0.6/lib/active_support/lazy_load_hooks.rb:71:in `class_eval'
# /usr/local/bundle/gems/activesupport-6.0.6/lib/active_support/lazy_load_hooks.rb:71:in `block in execute_hook'
# /usr/local/bundle/gems/activesupport-6.0.6/lib/active_support/lazy_load_hooks.rb:61:in `with_execution_control'
# /usr/local/bundle/gems/activesupport-6.0.6/lib/active_support/lazy_load_hooks.rb:66:in `execute_hook'
# /usr/local/bundle/gems/activesupport-6.0.6/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
# /usr/local/bundle/gems/activesupport-6.0.6/lib/active_support/lazy_load_hooks.rb:51:in `each'
# /usr/local/bundle/gems/activesupport-6.0.6/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
# /usr/local/bundle/gems/actionpack-6.0.6/lib/action_controller/base.rb:269:in `<class:Base>'
# /usr/local/bundle/gems/actionpack-6.0.6/lib/action_controller/base.rb:166:in `<module:ActionController>'
# /usr/local/bundle/gems/actionpack-6.0.6/lib/action_controller/base.rb:7:in `<main>'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
# /usr/local/bundle/gems/zeitwerk-2.6.6/lib/zeitwerk/kernel.rb:38:in `require'
# /usr/local/bundle/gems/actionview-6.0.6/lib/action_view/test_case.rb:13:in `<class:TestCase>'
# /usr/local/bundle/gems/actionview-6.0.6/lib/action_view/test_case.rb:12:in `<module:ActionView>'
# /usr/local/bundle/gems/actionview-6.0.6/lib/action_view/test_case.rb:10:in `<main>'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
# /usr/local/bundle/gems/zeitwerk-2.6.6/lib/zeitwerk/kernel.rb:38:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
# /usr/local/bundle/gems/zeitwerk-2.6.6/lib/zeitwerk/kernel.rb:38:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
# /usr/local/bundle/gems/zeitwerk-2.6.6/lib/zeitwerk/kernel.rb:38:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
# /usr/local/bundle/gems/zeitwerk-2.6.6/lib/zeitwerk/kernel.rb:38:in `require'
# ./spec/spec_helper.rb:5:in `<main>'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/bootsnap-1.15.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require'
# /usr/local/bundle/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
# /usr/local/bundle/gems/zeitwerk-2.6.6/lib/zeitwerk/kernel.rb:38:in `require'
# ./spec/rails_helper.rb:10:in `<top (required)>'
# ./spec/controllers/basic_controller_spec.rb:1:in `require'
# ./spec/controllers/basic_controller_spec.rb:1:in `<top (required)>'

CodePudding user response：

Did you make any huge jumps between Rubies? You should have moved to 2.7 first, then when that works okay, you go to 3.0 and so on. That was what I did after a huge jump broke and I did not even know where the problem is coming from. I rolled back and made little jumps and it all worked out. I understand this is not a code solution but I hope it helps anyway.

CodePudding user response：

So, it turned out that the project did not have any dependency on the database so require "active_record/railtie" was dropped in the application.rb but there was an explicit call in the spec/rails_helper.rb that was referring to ActiveRecord - Object.send(:remove_const, :ActiveRecord). After dropping that call, it started working. I am not sure why this was working previously in the first place. Thanks for all the help!