class Users::AuthorizationsController < ApplicationController
  inherit_resources
  belongs_to :user
  actions :destroy

  def destroy
    authorize resource
    destroy! do |format|
      format.html { redirect_to edit_user_path(parent) }
    end
  end
end

class Users::AuthorizationsController < ApplicationController
  respond_to :html

  def destroy
    authorization = parent.authorizations.find(params[:id])
    authorize authorization
    authorization.delete
    respond_with authorization, location: edit_user_path(parent)
  end

  private

  def parent
    @user ||= User.find(params[:user_id])
  end
end

Remove inherit_resources from authorizations controller
Remove inherit_resources from authorizations controller
