I have a nested form, like:
<% form_for @invoice do |f| %> <%= render :partial => "invoice_item_fields", :locals => {:f => f} %> <% end %>
and _invoice_items_fields:
<% f.fields_for :invoice_items do |builder| %> <%= link_to_remove_fields "remove", builder %> <%= builder.collection_select(:product_id, Product.all, :id, :name) %> <%= builder.text_field :quantity, :size => 4,%> <% end %>
When i submit the form and it not pass the validations it render the new action again. The thing is the selected value for :product_id is no remembered, but the :quantity is ok. I read that i should setup an instance variable in the controller with the value of the selected option and then do something like:
<%= builder.collection_select(:product_id, Product.all, :id, :name, :selected => @selected_product) %>
but the thing is the application could have many :invoice_items, so i don't know what to do for the select field "remember" the values.
Thanks.
