action-center-platform/app/controllers/exceptions_controller.rb

class ExceptionsController < ApplicationController
  layout "application"

  def show
    @exception       = env["action_dispatch.exception"]
    @status_code     = ActionDispatch::ExceptionWrapper.new(env, @exception).status_code
    @rescue_response = ActionDispatch::ExceptionWrapper.rescue_responses[@exception.class.name]

    respond_to do |format|
      format.html { render :show, status: @status_code, layout: !request.xhr? }
      format.xml  { render xml: details, root: "error", status: @status_code }
      format.json { render json: { error: details }, status: @status_code }
    end
  end

  protected

  def details
    @details ||= {}.tap do |h|
      I18n.with_options scope: [:exception, :show, @rescue_response], exception_name: @exception.class.name, exception_message: @exception.message do |i18n|
        h[:name]    = i18n.t "#{@exception.class.name.underscore}.title", default: i18n.t(:title, default: @exception.class.name)
        h[:message] = i18n.t "#{@exception.class.name.underscore}.description", default: i18n.t(:description, default: @exception.message)
      end
    end
  end
  helper_method :details
end