I''m trying to save a username along with profiles (User has_many Profiles; Profile belongs_to User). I had a portion of this working (updating user info) but I cannot create new user records. I get the following error: You have a nil object when you didn''t expect it! The error occurred while evaluating nil.build Parameters: {"commit"=>"Create record", "profile"=>{"company"=>"", "new_user_attributes"=>[{"username"=>"jlee", "active"=>"1"}], "new_someid_attributes"=>[{"someid"=>"123456789"}], "type_id"=>"2", "first_name"=>"Jeffrey", "last_name"=>"Lee"}, "authenticity_token"=>"65507986d1912380edf522b5b9f7ee3763c6dc0d"} I am getting stuck on the profile model code below: # Users def new_user_attributes=(user_attributes) user_attributes.each do |attributes| user.build(attributes) end end def existing_user_attributes=(user_attributes) user.reject(&:new_record?).each do |user| attributes = user_attributes[user.id.to_s] if attribute user.attributes = attributes else user.delete(email) end end end def save_user user.save(false) end New method in profiles_controller: def new @profile = Profile.new @profile.user = User.new end User partial: <div class="user"> <% new_or_existing = user.new_record? ? ''new'' : ''existing'' %> <% prefix = "profile[#{new_or_existing}_user_attributes][]" %> <% fields_for prefix, user do |user_form| -%> <%= label :user_form, :user, "Username" %><%user_form.text_field :username %> <%= user_form.hidden_field :active, :value => "1" %> <% end -%> </div> --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---