Undefined instance method “respond_to” in Rails 5 API Controller

Question

In rails 5 created with --api I have an error

NoMethodError (undefined method `respond_to\' for #
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Answer 1

As of Rails 4.2, this functionality no longer ships with Rails, but can easily be included with the responders gem (like Max noted in comments above).

Add gem 'responders' to your Gemfile, then

$ bundle install
$ rails g responders:install

Sources:
http://edgeguides.rubyonrails.org/4_2_release_notes.html#respond-with-class-level-respond-to https://github.com/plataformatec/responders