Is a gem ready for Rails 4 or 5?

Rails 4: 615 ready, 38 not ready, and 433 unknown
Rails 5: 163 ready, 11 not ready, and 912 unknown
Name Status Rails 4 Notes Rails 4 Status Rails 5 Notes Rails 5 Status or notes updated
sidekiq-pro ready

Not dependent on Rails

ready

Not dependent on Rails

5 months ago
connection_pool ready

Not dependent on Rails

ready

Not dependent on Rails

5 months ago
sidekiq-cron ready

works with Activejob (Rails 4.2+) and has been present and working in our app for years.

ready

Probably ready: there are live stories of people using it with rails 5.

5 months ago
better_errors ready

Tested on three projects, it is working with Rails 4.

ready

Ready for Rails 5 - but not sure from what version. Latest version (v2.5.0) runs on 5.2 https://github.com/BetterErrors/better_errors/releases

5 months ago
binding_of_caller ready

Does not depend on Rails.

ready

does not depend on Rails

5 months ago
capybara-screenshot ready

Doesn't depend on rails.

ready

does not depend on Rails

5 months ago
carmen ready

The carmen gem has been split. The carmen gem no longer has any dependencies on Rails. The Rails helpers have been split off into the carmen-rails gem.

ready

does not depend on Rails

5 months ago
carrierwave ready

https://github.com/carrierwaveuploader/carrierwave/blob/master/History.txt#L61

ready

5.1 from v1.1.0, 5.0 from 1.0.0.beta

5 months ago
dalli ready

-

ready

5.2 from v2.7.8, 5.0 from v2.7.6

5 months ago
faraday ready

In use.

ready

does not depend on Rails

5 months ago
foreman ready

-

ready

when not bundled in Gemfile. See https://github.com/ddollar/foreman/issues/688#issuecomment-326615890

5 months ago
heroku_rails_deflate ready

https://github.com/mattolson/heroku_rails_deflate/issues/13

not ready

https://github.com/mattolson/heroku_rails_deflate/pull/24 ; https://github.com/mattolson/heroku_rails_deflate/issues/26#issuecomment-360893277

5 months ago
jbuilder ready

-

ready

5.2 from v2.8.0, 5.1 from v2.6.3, 5.0 from v2.5.0

5 months ago
jquery-rails ready

-

ready

https://github.com/rails/jquery-rails#installation mentions Rails 5.1. See also Taryn's comment

5 months ago
jquery-ui-rails ready

from gem version 4.0.2 (source)

ready

readme mentions Rails 5.0 (https://github.com/jquery-ui-rails/jquery-ui-rails#warning)

5 months ago
launchy ready

does not depend on rails

ready

does not depend on rails

5 months ago
bootstrap-sass ready

-

ready

mentioned in the README

7 months ago
capybara ready

https://github.com/jnicklas/capybara/pull/1024

ready

mentioned in the README

7 months ago
bootstrap ready

https://github.com/twbs/bootstrap-rubygem

ready

https://github.com/twbs/bootstrap-rubygem

8 months ago
mongoid not ready

Version 4 will support Rails 4 but it hasn't been released yet

ready

See https://docs.mongodb.com/mongoid/master/tutorials/mongoid-rails/

8 months ago