[Rails] Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id

Hey all,

I know that this:

Called id for nil, which would mistakenly be 4 -- if you really wanted
the id of nil, use object_id

means that I have an instance variable that has not been initialized.
However, I'm a little confused as to what to do in a signup form for
form_for:

<% content_for :login do %>
<% form_for @user, :url => { :action => "login" } do |f| %>
<%= error_messages_for 'user' %><br/>
<%= f.label(:user_login, "Username")%>
<%= f.text_field(:login) %><br/>
<%= f.label(:user_password, "User Password")%>
<%= f.password_field(:password) %><br/>
<%= f.submit("Sign Up") %>

<%= link_to 'Register', :action => 'signup' %> |
<%= link_to 'Forgot my password', :action => 'forgot_password' %>
<% end %>
<% end %>

Because I didn't declare @user in login method:

def login
if request.post?
if session[:user] = User.authenticate(params[:user][:login],
params[:user][:password])
flash[:message] = "Login successful"
redirect_to_root
else
flash[:warning] = "Login unsuccessful"
end
end

end

There is no @user and so interpreter throws the exception. However, what
can I do in order to allow someone the opportunity to signin when using
a form? Do I create a temporary blank user: @user = User.new?

Thanks for response.

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