ActionView::MissingTemplate in Flipflop::Features#index in Rails 7

[mldoscar]

Hello. We're experiencing this exception after Rails 7.0.2 upgrade, even using latest flipflop gem (2.6.0), and also same behavior using master branch.

Example for repeating the error: https://github.com/mldoscar/flipflop-issue-on-r7-example

Our application mounts the Flipflop engine in routes.rb like this:

Rails.application.routes.draw do
  mount Flipflop::Engine => '/flipflop'
end

Then when I try to surf to this address localhost:3000/flipflop the following exception is raised:

ActionView::MissingTemplate in Flipflop::Features#index

Missing partial flipflop/stylesheets/_flipflop.css with {:locale=>[:en], :formats=>[:html], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby, :coffee, :jbuilder]}.

We're aware that starting from Rails 7, rendering files with extension would cause an exception. Does anyone else is experiencing this issue?

Ruby: 2.7.4 Rails: 7.0.2.3 RVM: 1.29.12

Also i'm going to submit a PR in order to expect feedback if it's the best way to solve this issue

[leoarnold]

Fixed by #40. Released in v2.7.0.