search for: employeephonenumber

...#39;'employee_phone_number[]'', @employee_phone_number do |f| %> <%= f.text_field phone_number %> <% end %> and the ''add phone number'' link to: <%= link_to_function ''add phone number'', update_page { |page| @employee_phone_number = EmployeePhoneNumber.new; page.insert_html(:after, :phone_numbers, render :partial => ''phone_number'')} %> This is a little closer, as now as long as the user only adds one phone number (there was already an existing one with id 2), you get a params like this: {"employee_phone_number"...