I've not tried this myself, but I think it should work:
define_index do
# ...
end
# need to force the above block to be processed
define_indexes
# it's important you add this callback after processing the index
# else this will happen before Thinking Sphinx's callback.
before_save :disable_delta
# ...
private
def disable_delta
self.delta = false unless body_changed?
end
You can make that method as complicated as you like. Let me know how this goes.
Cheers
--
Pat
On 02/01/2011, at 2:13 PM, jollibee wrote:
> Sphinx will re-index the record every time we update it when we use
> delta, even if the updated data is not in the record index field. For
> example, we index 'body' field in notes.rb, but think-sphinx will re-
> index when we update the visited_at of a note.
>
> Is there any way to disable the unnecessary index. Only index when
> update the 'body' field.
>
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