Example of using sentry as guard clause/routing for Rails controllers

sentry_example_controller.rb

class PersonsController
  extend ::Sentry
  
  def show
    # do stuff
  end
  sentry_for :show, :expect => [:person], :if_not => :handle_person_not_found

  def subscribe
    # do stuff
  end
  sentry_for :subscribe, :expect => [:id], :if_not => :handle_missing_arguments
  sentry_for :subscribe, :expect => [:person], :if_not => :handle_person_not_found

  protected
  def person
    PersonRepository.find(id)
  end
 
  def id
    params[:id]
  end
 
  def handle_missing_arguments
    render(:text => 'Missing arguments', :status => :internal_server_error, :content_type => Mime::TEXT)
  end
 
  def handle_person_not_found
    render(:text => 'Not Found', :status => :not_found, :content_type => Mime::TEXT)
  end
end