I''m trying to use the rails_upgrade plugin to upgrade a 2.3.4 app to 3.2.9 and running into all kinds of things that "don''t work". I''ll start with a specific problem. Hopefully you folks can help me discover a "pattern" so I don''t need to post to this group for every problem. The "first" problem: Based on the activemerchant documentation, the 2.3.4 plugin should be replaced by a gem. I removed the plugin and added the gem to the Gemfile. Bundler runs clean. But when I then try rake rails:upgrade:check again, I get uninitialized constant ActiveMerchant::Validateable::HashWithIndifferentAccess -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/J4RIZ_qKwTMJ. For more options, visit https://groups.google.com/groups/opt_out.