I have the following piece of code in my controller

def index

 session[:previous_url] = URI(request.referer).path 

  if session[:previous_uri] != new_path
     redirect_to registration_path(id: current_user.associate_username)
   end

end

However this does not actually work and i get a bad URI error. I just want to check if the request came from a particular page and if not redirect it to another page. I would also like to know if there is a better way for doing this?.Thank you