Rails - Feb 2010 - accepts_nested_attributes_for with has_many => :through

I have two models, links and tags, associated through a 3rd model,
link_tags.  I added the following to my link model,

  has_many :tags, :through => :link_tags
  has_many :link_tags

  accepts_nested_attributes_for :tags, :allow_destroy => :false,
  :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }

and put this in a partial called by the new and edit forms for links,

  <%= f.error_messages %>

  <p>
    <%= f.label :uri %><br />
    <%= f.text_field :uri %>
  </p>
  <p>
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </p>

  <h2>Tags</h2>
  <% f.fields_for :tags do |tag_form| %>
  <p>
    <%= tag_form.label :name, ''Tag:'' %>
    <%= tag_form.text_field :name %>
  </p>
  <% unless tag_form.object.nil? || tag_form.object.new_record? %>
  <p>
    <%= tag_form.label :_delete, ''Remove:'' %>
    <%= tag_form.check_box :_delete %>
  </p>
  <% end %>
  <% end %>

  <p>
    <%= f.submit ''Update'' %>
  </p>

The POST on submit fails with the following error:

Tag(#-621698598) expected, got Array(#-609734898)

Does anyone know the necessary steps to do this?  I''ve been basing it
off the multi-model section of this:
http://guides.rubyonrails.org/getting_started.html
, but it seems incomplete for has_many => :through.

Thanks,
Andrew

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have a look:
http://railscasts.com/episodes/73-complex-forms-part-1
http://railscasts.com/episodes/73-complex-forms-part-2
http://railscasts.com/episodes/73-complex-forms-part-3

2010/2/6 acreadinglist
<andrew.cove-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> I have two models, links and tags, associated through a 3rd model,
> link_tags.  I added the following to my link model,
>
>  has_many :tags, :through => :link_tags
>  has_many :link_tags
>
>  accepts_nested_attributes_for :tags, :allow_destroy => :false,
>  :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
>
> and put this in a partial called by the new and edit forms for links,
>
>  <%= f.error_messages %>
>
>  <p>
>    <%= f.label :uri %><br />
>    <%= f.text_field :uri %>
>  </p>
>  <p>
>    <%= f.label :title %><br />
>    <%= f.text_field :title %>
>  </p>
>
>  <h2>Tags</h2>
>  <% f.fields_for :tags do |tag_form| %>
>  <p>
>    <%= tag_form.label :name, ''Tag:'' %>
>    <%= tag_form.text_field :name %>
>  </p>
>  <% unless tag_form.object.nil? || tag_form.object.new_record? %>
>  <p>
>    <%= tag_form.label :_delete, ''Remove:'' %>
>    <%= tag_form.check_box :_delete %>
>  </p>
>  <% end %>
>  <% end %>
>
>  <p>
>    <%= f.submit ''Update'' %>
>  </p>
>
> The POST on submit fails with the following error:
>
> Tag(#-621698598) expected, got Array(#-609734898)
>
> Does anyone know the necessary steps to do this?  I''ve been basing
it
> off the multi-model section of this:
> http://guides.rubyonrails.org/getting_started.html
> , but it seems incomplete for has_many => :through.
>
> Thanks,
> Andrew
>
> --
> 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
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> .
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>

-- 
tommy xiao
E-mail: xiaods(AT)gmail.com

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