Rails - Nov 2011 - add dynamic nested attributes without nested form gem

Hello people

In my rails 3.0.9  app I''m trying to add nested attributes
dynamically, but I don''t want to use "nested form gem"

So I found this example

https://github.com/alloy/complex-form-examples/blob/a234fde4419836f277d7e340657f1d8418911d68/app/helpers/projects_helper.rb

 but this code doesn''t work

module ProjectsHelper
  def remove_link_unless_new_record(fields)
    unless fields.object.new_record?
      out = ''''
      out << fields.hidden_field(:_delete)
      out << link_to_function("remove", "$
(this).up(''.#{fields.object.class.name.underscore}'').hide(); $
(this).previous().value = ''1''")
      out
    end
  end
end

I think that lines which starts with "out <<" make some
conflicts,
because I''ve checked the html (firebug) and the simbols
"<" and ">"
doesn''t appear

&lt;a href="#"
onclick="$(this).up(''.task'').hide(); $
(this).previous().value = ''1''; return
false;"&gt;remove&lt;/a&gt;

Can you help me please?? Thanks

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Ok, I''ve followed this cast
http://railscasts.com/episodes/197-nested-model-form-part-2
but I get an error when I try to add the link to "add fields" (remove
works as expected) this is the error

    NoMethodError in Projects#new

    Showing /home/angelo/nestattr/app/views/projects/_form.html.erb
where line #24 raised:

    undefined method `klass'' for nil:NilClass

    Extracted source (around line #24):

    21: 		<%= render "task", :f => t %>
    22: 	<% end %>
    23: <p>
    24: 	 <%= link_to_add_fields "Add task", f, :task %>
    25: </p>
    26:   <div class="actions">
    27:     <%= f.submit %>

Currently I''m using rails 3.0.9, so maybe something has changed since
then, please, tell me what''s wrong


On 4 nov, 15:48, Angelo Cordova
<acord...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hello people
>
> In my rails 3.0.9  app I''m trying to add nested attributes
> dynamically, but I don''t want to use "nested form gem"
>
> So I found this example
>
> https://github.com/alloy/complex-form-examples/blob/a234fde4419836f27...
>
>  but this code doesn''t work
>
> module ProjectsHelper
>   def remove_link_unless_new_record(fields)
>     unless fields.object.new_record?
>       out = ''''
>       out << fields.hidden_field(:_delete)
>       out << link_to_function("remove", "$
>
(this).up(''.#{fields.object.class.name.underscore}'').hide(); $
> (this).previous().value = ''1''")
>       out
>     end
>   end
> end
>
> I think that lines which starts with "out <<" make some
conflicts,
> because I''ve checked the html (firebug) and the simbols
"<" and ">"
> doesn''t appear
>
> &lt;a href="#"
onclick="$(this).up(''.task'').hide(); $
> (this).previous().value = ''1''; return
false;"&gt;remove&lt;/a&gt;
>
> Can you help me please?? Thanks
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