git init

app/helpers/application_helper.rb

@@ -0,0 +1,10 @@
+module ApplicationHelper
+  def link_to_add_fields(name, f, association)
+    new_object = f.object.send(association).klass.new
+    id = new_object.object_id
+    fields = f.fields_for(association, new_object, child_index: id) do |builder|
+      render(association.to_s.singularize + "_fields", f: builder)
+    end
+    link_to(name, '#', id: "add_#{association.to_s.singularize}" , class: "add_fields", data: {id: id, fields: fields.gsub("\n", "")})
+  end
+end