Rails API Controller Error Handling Pattern

anything_controller.rb

class AnythingController < ApiController
  def index
     raise ApiError.new("My custom message", 401)
  end
end

api_controller.rb

class ApiController < ActionController::Base
  rescue_from ApiError do |exception|
    render json: Api::V1::ResponseService.error!(exception.message, exception.status_code)
  end
end

api_error.rb

class ApiError < StandardError
  def initialize(message="API Error", error_code=500)
    @error_code = error_code
    super(message)
  end
end