Rails - Jun 2006 - Custom Primary Key, Using Primary Key in Form gives "before_type_cast" error?

Hi guys,

I''ve got a problem here which i need help from the pro''s in
this mailing list

I have a legacy app where the User table has a custom structure where
"User_id" (username) is the primary key as well as the username used
to log in

User.rb (model)
class User < ActiveRecord::Base
  set_table_name "cmf901"
  set_primary_key "user_id"
end

Login Controller
class LoginController < ApplicationController
  def login
    @user = User.new
  end
end


When creating a Login form (login.rhtml)
<%= start_form_tag :action => "process" %>
<%= text_field ''user'', ''user_id'',
:MAXLENGTH =>"10" %>
<%= text_field ''user'', ''user_password'',
:MAXLENGTH =>"20" %>
<%= submit_tag "Login" %>
<%= end_form_tag %>


I get an error

NoMethodError in Login#login

Showing app/views/login/login.rhtml where line #11 raised:

undefined method `user_id_before_type_cast'' for #<User:0x3cb61e8>

Extracted source (around line #11):

8:   </tr>
9:   <tr>
10:     <td>Username</td>
11:     <td><%= text_field ''user'',
''user_id'', :MAXLENGTH =>"10"  %></td>
12:   </tr>
13:   <tr>
14:     <td>Password</td>

All i want to do is use the standard rails way to create a login
form(used in Scaffold to create new/update) and do some authentication