> Try adding :nested => true to params too

Still an error. The 9659 id is that of the related Institution record,
not the Diploma record.

Seems like we should be finding and deleting the record from the join
table, no? Which, in this case, is the diplomas_institutions table.

Processing Admin::DiplomasController#destroy_existing (for ::1 at
2010-04-12 09:56:42) [DELETE]
  Parameters: {"eid"=>"96d58316c473e2f24db9c53a79cf268f",
"parent_column"=>"diplomas", "nested"=>"true",
"action"=>"destroy_existing", "_method"=>"delete", "id"=>"5536",
"parent_model"=>"Diploma", "controller"=>"admin/diplomas"}
  Diploma Load (0.3ms)   SELECT * FROM `diplomas` WHERE
(`diplomas`.`id` = 9659)

ActiveRecord::RecordNotFound (Couldn't find Diploma with ID=9659):
  vendor/rails/activerecord/lib/active_record/base.rb:1586:in
`find_one'
  vendor/rails/activerecord/lib/active_record/base.rb:1569:in
`find_from_ids'
  vendor/rails/activerecord/lib/active_record/base.rb:616:in `find'
  vendor/plugins/active_scaffold/lib/active_scaffold/finder.rb:173:in
`find_if_allowed'
  vendor/plugins/active_scaffold/lib/active_scaffold/actions/nested.rb:
198:in `do_destroy_existing'
  vendor/plugins/active_scaffold/lib/active_scaffold/actions/nested.rb:
108:in `destroy_existing'
  vendor/rails/actionpack/lib/action_controller/base.rb:1331:in `send'
  vendor/rails/actionpack/lib/action_controller/base.rb:1331:in
`perform_action_without_filters'
  vendor/rails/actionpack/lib/action_controller/filters.rb:617:in
`call_filters'

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