Try <% form_for UserSession.new ... if you want the form to work
anywhere, or make sure that @user_session is set in the controller,
eg. @user_session = UserSession.new

Paul

On Sep 25, 6:54 am, bui <[email protected]> wrote:
> The controller is the "home" controller and looks like this (very
> basic):
>
> class HomeController < ApplicationController
>   def index
>   end
> end
>
> The view for the home controller is is just a basic home page and I
> just wanted to render a login partial there since I'm also planning to
> use it elsewhere in the app.
>
> I assumed that there is no user_session, since a user is not logged in
> at this point.  So, I didn't think I would need to pass it anything.
> I can hithttp://mysite/lgoinwithout passing any instance variables
> and it shows the partial properly.
>
> Here's a trace:
>
> Showing app/views/user_sessions/_user_session.html.erb where line #1
> raised:
>
> Called id for nil, which would mistakenly be 4 -- if you really wanted
> the id of nil, use object_id
>
> Extracted source (around line #1):
>
> 1: <% form_for @user_session, :url => user_session_path do |f| %>
> 2:   <%= f.error_messages %>
> 3:   <%= f.label :email %><br />
> 4:   <%= f.text_field :email %><br />
>
> Trace of template inclusion: app/views/home/index.html.erb
>
> RAILS_ROOT: c:/wwwroot/ror/blostm
> Application Trace | Framework Trace | Full Trace
>
> C:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.4/lib/action_controller/
> record_identifier.rb:76:in `dom_id'
> C:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.4/lib/action_view/
> helpers/record_identification_helper.rb:16:in `dom_id'
> C:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.4/lib/action_view/
> helpers/form_helper.rb:293:in `apply_form_for_options!'
> C:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.4/lib/action_view/
> helpers/form_helper.rb:277:in `form_for'
> c:/wwwroot/ror/mysite/app/views/user_sessions/_user_session.html.erb:
> 1:in
> `_run_erb_app47views47user_sessions47_user_session46html46erb_locals_object 
> _user_session'
> c:/wwwroot/ror/mysite/app/views/home/index.html.erb:4:in
> `_run_erb_app47views47home47index46html46erb'
>
> By the way, thanks for responding to my post.
>
> On Sep 24, 4:01 pm, pharrington <[email protected]> wrote:
>
>
>
> > On Sep 24, 3:06 pm, bui <[email protected]> wrote:
>
> > > New to Rails.  Using Authlogic for authentication and went through
> > > tutorial at github.  Having a bit of a problem getting the login
> > > screen to render as a partial from a different view file.
>
> > > I have a index.html.erb view file for the "home" controller.
>
> > > I tried <%= render :partial => "user_sessions/user_session" %>
>
> > > but it fails with this error:
>
> > > "Called id for nil, which would mistakenly be 4 -- if you really
> > > wanted the id of nil, use object_id"
>
> > > user_sessions is the view directory for the login form created through
> > > the Authlogic tutorial.  I created a partial called
> > > _user_session.html.erb which contains the entire login form and looks
> > > like this:
>
> > > <% form_for @user_session, :url => user_session_path do |f| %>
> > >   <%= f.error_messages %>
> > >   <%= f.label :email %><br />
> > >   <%= f.text_field :email %><br />
> > >   <br />
> > >   <%= f.label :password %><br />
> > >   <%= f.password_field :password %><br />
> > >   <br />
> > >   <%= f.check_box :remember_me %><%= f.label :remember_me %><br />
> > >   <br />
> > >   <%=  image_submit_tag("/images/Login Button.jpg") %>
> > > <% end %>
>
> > > user_sessions/new.html.erb now looks like this
>
> > > <%= render :partial => 'user_session' %>
>
> > > And this works:  http://mysite/login (setup through a named route)
> > > And this works:  http://mysite/user_sessions/new
>
> > > However, trying this <%= render :partial => "user_sessions/
> > > user_session" %> in the home/index.html.erb view fails.
>
> > > Can anyone help with this?  I seem to be missing something really
> > > fundamental here.
>
> > > Thanks
>
> > A guess, as I don't have the full backtrace and don't know what the
> > controller that passes to the view that calls the partial rendering
> > does: is the @user_session instance variable nil?
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