can't pass locals to parital Rails - ruby-on-rails-3

Question

I have a partial _new_user_form.html.erb
<%= form_for(#user, :remote => true, :html => {:id => 'new_user_form'}) do |f|%>
<strong><%= :form_text %></strong>
<%= f.text_field :email, :placeholder => get_placeholder_text(#board), :size => "30" %>
<%= hidden_field_tag :role, role %>
<%=f.submit "SAVE", :class => "button-small" %>
<% end %>
In the show.rb I want to use it and pass in some partial variables as follows:
<%= render 'users/new_user_form', :locals=> {:role => "Celebrant" } %>
However I get this error:
undefined local variable or method `role' for #<#<Class:0x00000103d5e8b0>:0x00000103d5b930>
I read the documents about passing in locals and this seems correct. What am I doing wrong?

Answer 1

You're combining the short and long forms. Either of these are correct (identical):
render 'my_partial', :foo => 'bar'
render :partial => 'my_partial', :locals => { :foo => 'bar' }

Answer 2

I think you're calling render incorrectly. From the fine manual:
If no options hash is passed or :update specified, the default is to render a partial and use the second parameter as the locals hash.
So you end up going down this branch in the source:
view_renderer.render_partial(self, :partial => options, :locals => locals)
and that makes your call the same as this:
render :partial => 'users/new_user_form', :locals => { :locals => { :role => 'Celebrant } }
Note the extra level of nesting for :locals. Try this:
render 'users/new_user_form', { :role => 'Celebrant' }
I'm looking at (and using) 3.1 so your version might be a little different.