The issue here is your full_name field. You can merge columns together 
automatically:

 indexes [first_name, last_name], :as => :full_name, :sortable => true

See if that fixes the unnecessary delta issue.

Cheers

-- 
Pat

On 20/06/2010, at 12:27 AM, Lucas Húngaro wrote:

> Hi Pat, here's the block:
> 
> define_index do
>   # fields
>   indexes username, :sortable => true
>   indexes index_email, :sortable => true
>   indexes "concat(first_name, ' ', last_name)", :as
> => :full_name, :sortable => true
> 
>   # weights
>   set_property :field_weights => {"username" => 100, "full_name" =>
> 100, "email" => 50}
> 
>   # conditions
>   where "active = 1"
> 
>   # delta
>   set_property :delta => :delayed
> end
> 
> 
> On Jun 19, 5:45 am, Pat Allan <[email protected]> wrote:
>> Hi Lucas
>> 
>> Thinking Sphinx actually tries to be this smart, but it really depends on 
>> the index definition - if there are fields or attributes where TS cannot 
>> figure out if they've changed (if you're using Rails 2.0 or earlier, or if 
>> you have SQL snippets for fields or attributes), then it just assumes the 
>> delta update is required.
>> 
>> What does your User model's define_index block look like?
>> 
>> --
>> Pat
>> 
>> On 19/06/2010, at 4:14 PM, Lucas Húngaro wrote:
>> 
>> 
>> 
>>> Hi there.
>> 
>>> I'm using a delta index with delayed_job but a new indexing job is
>>> enqueued on every update of a record, no matter if the column is
>>> indexed or not. How can I configure TS to update the delta attribute
>>> only in case of changes on the indexed columns?
>> 
>>> Example: every time someone signs in, the app increments a column
>>> called login_count on the user record. This column is irrelevant for
>>> searching purposes and it's not being indexed, but triggers a delta
>>> update anyway.
>> 
>>> Thanks.
>> 
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