Devise: Rails (6.0.0.0.alpha): Devise(4.4.3) Error: undefined local variable or method `mimes_for_respond_to' for DeviseController:Class

[syit]

Environment

• Ruby [2.4.1]
• Rails [6.0.0.alpha]
• Devise [4.4.3]

Current behavior

When I Upgraded application from rails 5.2 to 6.0.0.alpha, application starts getting crash showing error on sign_in page.

   Started GET "/admins/sign_in" for 127.0.0.1 at 2018-06-05 08:23:21 +0530
   (1.9ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
  ↳ /home/rotlu_crush/.rvm/gems/ruby-2.4.1/gems/activerecord-5.2.0/lib/active_record/log_subscriber.rb:98

ActionController::RoutingError (undefined local variable or method `mimes_for_respond_to' for DeviseController:Class):

devise (4.4.3) app/controllers/devise_controller.rb:18:in `<class:DeviseController>'
devise (4.4.3) app/controllers/devise_controller.rb:4:in `<main>'
bootsnap (1.3.0) lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:100:in `load'
bootsnap (1.3.0) lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:100:in `load'
activesupport (5.2.0) lib/active_support/dependencies.rb:468:in `block in load_file'
activesupport (5.2.0) lib/active_support/dependencies.rb:653:in `new_constants_in'
activesupport (5.2.0) lib/active_support/dependencies.rb:467:in `load_file'

Expected behavior

Devise wouldn't crash, It should work with rails 6.0.0.alpha

[psantos10]

I think that "responders" does not support Rails 6.0.x yet.

If you take a look at responders.gemspec you will see the following lines:

s.add_dependency "railties", ">= 4.2.0", "< 6.0"
s.add_dependency "actionpack", ">= 4.2.0", "< 6.0"

So, responders gem requires "railties < 6.0.x", but you are using railties >= 6.0.x

[rafaelfranca]

Rails 6 is really early in development and devise or responders have no plan to support a version of rails that early. We will fix those issue before the 6.0.0.beta release.

[kirantpatil]

I am on current master and still having the same issue will it be fixed within January 15: Beta 1 as mentioned in https://weblog.rubyonrails.org/2018/12/20/timeline-for-the-release-of-Rails-6-0/.

Thanks.

[nikolaokonesh]

gem 'responders', github: 'plataformatec/responders'

[francesco-loreti]

Same problem with rails 6.0.0.beta1

[tegon]

Like @nikolaokonesh pointed out above, it's a matter of updating the responders dependency. I'm going to work on this and send a pull request.

[tegon]

It works now with responders 2.4.1.
I think a bundle update responders for existing applications might do it.