Hi to everybody, well i recently became a RoR developer, web i was following the video class from Lynda, and i introduce more code in my aplicacion, my application is a music store web site, ok so i add the funcionality of add clients, for that i need from my client, his user and password, so it will be 1 user per client, for that reason i use at my model validates_uniqueness_of :user ############## here is my model ###########3 class Customer < ActiveRecord::Base has_many :orders attr_accessible :first_name,:last_name, :zip_code,:user,:hashed_password validates_uniqueness_of :user ########################################## and when i run the application and want to add a diferent user from those are exist it work fine, bue when i want to add a user that is already add db it blow up and apears this : /////////////////////7777 ArgumentError in CustomersController#create too few arguments app/controllers/customers_controller.rb:71:in `format'' app/controllers/customers_controller.rb:71:in `create'' ////////////////////////77 ok so, what i found there was 70> flash[:notice] = ''Error!!!! intentelo de nuevo'' 71> format.html { render :action => "new" } 72> format.xml { render :xml => @customer.errors, :status => :unprocessable_entity } ################ i change those , the first line for 70> flash[:notice] = ''Error!!!! intentelo de nuevo'' 71> redirect_to (:action => ''new'' ) ### with this change i fix the problem, but, nothing appear i mean the message from the validates_uniqueness_of , it should appear that the user is already in use or something similar. Anyone can help me ?!?!! -- Posted via http://www.ruby-forum.com/.