Hi all, I''m testing rails3 with Datamapper on a simple project. I''ve 2 classes : class Societe include DataMapper::Resource property :id, Serial property :nom, String property :adresse, Text has n, :clients end class Client include DataMapper::Resource property :id, Serial property :prenom, String property :nom, String property :telephone, String property :courriel, String property :adresse, Text property :view_only, Boolean belongs_to :societe end I created them using rails generate scaffold (except belongs/ has of course). I''ve then have in the folder "view" 5 erb templates per class, and especially one (_form) used by "new" and "edit" templates. In order to select the society, I have added in client''s _form a select: <%= form_for(@client) do |f| %> <%= f.error_messages %> ... <div class="field"> <%= f.label :societe %><br /> <%= f.select(:societe_id, @societes.map{|s| [s.nom, s.id]}) %> </div> <div class="actions"> <%= f.submit %> </div> <% end %> In creation mode, everything is allright and the customer is created with the link to its society But when I edit, I have the following error: Showing /home/.../app/views/clients/_form.html.erb where line #30 raised: undefined method `societe_id'' for #<Client:0xa51833c> Extracted source (around line #30): 27: </div> 28: <div class="field"> 29: <%= f.label :societe %><br /> 30: <%= f.select(:societe_id, @societes.map{|s| [s.nom, s.id]}) %> 31: </div> 32: <div class="actions"> 33: <%= f.submit %> Any idea why it''s working with empty "client" and not with existing one? Thanks in advance, Sylvain -- 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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.