After removing all the root elements from our JSON API I ran into an issue with devise expecting the `sign_in` params to be wrapped in their respective scope (`user` in our case), so: ```ruby { user: { email: "[email protected]", password: "whatever } } ``` But with our new JSON API we wanted to get rid of the root element wrapping and wante…

devise.rb

# config/initializers/devise.rb

Devise.setup do |config|
  # .. snip
  
  config.warden do |manager|
    manager.default_strategies(:scope => :user).unshift :unwrapped_authenticatable
  end
end

unwrapped_authenticatable.rb

# config/initializers/unwrapped_authenticatable.rb

require 'devise/strategies/database_authenticatable'

module Devise
  module Strategies
    class UnwrappedAuthenticatable < DatabaseAuthenticatable

      private
      def params_auth_hash
        params.slice(:email, :password)
      end
    end
  end
end

Warden::Strategies.add(:unwrapped_authenticatable, Devise::Strategies::UnwrappedAuthenticatable)