I had the same thing this morning with a new project I had just
created.
I had to add the following line to my child controller:

protect_from_forgery :only => [:create, :update, :delete]

In your case, I think it will have to be put in the controller
associated to the sub-form.
This is only a workaround, though. There is probably a cleaner way to
do it.

Christian.

On Feb 24, 7:54 am, Wes Gamble <[email protected]> wrote:
> All,
>
> Rails 2.3
> AS - latest from github as of 02/24 00:22 CST.
>
> I have two models which are in a has_many/belongs_to relationship.
>
> If I try to create/edit either of these models and then attempt to
> create/update the associated model through the default subform, I get the
>
> ActionController::InvalidAuthenticityToken
>
>     in XYZController#edit_associated
>
> error on the AJAX call to do the update.
>
> Here's one of the stack traces - not sure how useful it will be:
>
> ActionController::InvalidAuthenticityToken
> (ActionController::InvalidAuthenticityToken):
>   actionpack (2.3.0)
> lib/action_controller/request_forgery_protection.rb:79:in
> `verify_authenticity_token'
>   activesupport (2.3.0) lib/active_support/callbacks.rb:178:in
> `evaluate_method'
>   activesupport (2.3.0) lib/active_support/callbacks.rb:166:in `call'
>   actionpack (2.3.0) lib/action_controller/filters.rb:225:in `call'
>   actionpack (2.3.0) lib/action_controller/filters.rb:629:in
> `run_before_filters'
>   actionpack (2.3.0) lib/action_controller/filters.rb:615:in `call_filters'
>   actionpack (2.3.0) lib/action_controller/filters.rb:610:in
> `perform_action_with_filters'
>   actionpack (2.3.0) lib/action_controller/benchmarking.rb:68:in
> `perform_action_with_benchmark'
>   actionpack (2.3.0) lib/action_controller/benchmarking.rb:68:in
> `perform_action_with_benchmark'
>   actionpack (2.3.0) lib/action_controller/rescue.rb:154:in
> `perform_action_with_rescue'
>   actionpack (2.3.0) lib/action_controller/flash.rb:141:in
> `perform_action_with_flash'
>   actionpack (2.3.0) lib/action_controller/base.rb:523:in `process'
>   actionpack (2.3.0) lib/action_controller/filters.rb:606:in
> `process_with_filters'
>   actionpack (2.3.0) lib/action_controller/base.rb:391:in `process'
>   actionpack (2.3.0) lib/action_controller/base.rb:386:in `call'
>   actionpack (2.3.0) lib/action_controller/routing/route_set.rb:433:in
> `call'
>   actionpack (2.3.0) lib/action_controller/dispatcher.rb:65:in `dispatch'
>   actionpack (2.3.0) lib/action_controller/dispatcher.rb:88:in `_call'
>   actionpack (2.3.0) lib/action_controller/dispatcher.rb:59:in `initialize'
>   activerecord (2.3.0) lib/active_record/query_cache.rb:29:in `call'
>   activerecord (2.3.0) lib/active_record/query_cache.rb:29:in `call'
>   activerecord (2.3.0)
> lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
>   activerecord (2.3.0) lib/active_record/query_cache.rb:9:in `cache'
>   activerecord (2.3.0) lib/active_record/query_cache.rb:28:in `call'
>   actionpack (2.3.0) lib/action_controller/params_parser.rb:15:in `call'
>   actionpack (2.3.0) lib/action_controller/rewindable_input.rb:25:in `call'
>   actionpack (2.3.0) lib/action_controller/session/cookie_store.rb:93:in
> `call'
>   actionpack (2.3.0) lib/action_controller/failsafe.rb:11:in `call'
>   actionpack (2.3.0) lib/action_controller/rack_ext/lock.rb:15:in `call'
>   actionpack (2.3.0) lib/action_controller/dispatcher.rb:83:in `call'
>   rails (2.3.0) lib/rails/rack/static.rb:27:in `call'
>   rails (2.3.0) lib/rails/rack/log_tailer.rb:17:in `call'
>   :1:in `initialize'
>
> Any thoughts?
>
> Thanks,
> Wes
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