Rails - Dec 2006 - Validation error objects?

I''m trying to figure out validation. I was looking at what exactly is
going on when using scaffolding and the error_messages_for method. I''m
not sure exactly what to ask.. My situation is that I have a form that
submits to a process method, and depending on one of the options, it
creates a new user type.. the validation examples in scaffolding are so
simple thought that when tearing it down and trying to bring it to my
particular case it doesn''t work.

here is the form:

<%= session[:verror_ob].errors if session[:verror_obj] != nil %>
<h2>Signup</h2>
<% if flash[:notice] %>
<%= flash[:notice] + ''<br/>'' %>
<% end %>

Are you a 1or a 2? <br/>
<%= start_form_tag "/signup/process_acct" %>
1: <input type="radio" name="acctType"
value="1" /> company next<br/>
company name <%= text_field ''user'',
''company_name'' %><br/>
contact name <%= text_field ''user'',
''contact_name'' %><br/>
firstname <%= text_field ''user'',
''firstname'' %><br/>
lastname <%= text_field ''user'',
''lastname'' %><br/>
email <%= text_field ''user'', ''email''
%><br/>
phone <%= text_field ''user'', ''phone''
%><br/>
address 1 <%= text_field ''address'',
''address_one'' %><br/>
address 2 <%= text_field ''address'',
''address_two'' %><br/>
city <%= text_field ''address'', ''city''
%><br/>
state <%= text_field ''address'', ''state''
%><br/>
zip <%= text_field ''address'', ''zip''
%><br/>
password <%= text_field ''user'',
''password'' %><br/>
<%= submit_tag "Signup!" %>
<%= end_form_tag %>

here is the process ruby:

def process_acct
		@user = params[:user]
		@acct_type = params[:acctType]
		@address = Address.new(params[:address])

		if @acct_type == ''1''
			@n = Nurse.new
			@n.firstname = @user[''firstname'']
			@n.lastname = @user[''lastname'']
			@n.email = @user[''email'']
			@n.phone = @user[''phone'']
			@n.password = Digest::SHA1.hexdigest(@user[''password''])
			begin
				Nurse.transaction(@address, @n) do
					if !@address.save
						session[:verror] = ''address''
						session[:verror_ob] = @a
						raise
					end
					@n.address_id = @address.id
					if !@n.save
						session[:verror] = ''nurse''
						session[:verror_ob] = @n
						raise
					end
				end
			rescue Exception => error
				redirect_to :action => ''index''
				return
			end

		elsif @acct_type == ''company''
			@c = Company.new
			@c.company_name = @user[''company_name'']
			@c.contact_name = @user[''contact_name'']
			@c.email = @user[''email'']
			@c.phone = @user[''phone'']
			@c.password = Digest::SHA1.hexdigest(@user[''password''])
			begin
				Company.transaction(@address, @c) do
					if !@address.save
						session[:verror] = ''address''
						raise
					end
					@c.address_id = @address.id
					if !@c.save
						session[:verror] = ''company''
						raise
					end
				end
			rescue Exception => error
				redirect_to :action => ''index''
				return
			end

		else
			redirect_to :action => ''index''
			return
		end

		#all went well
		redirect_to :controller => ''login''
		return



So how do I know what object to use the .error property for? in the
case of validation (source from error_messages_for).


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