Hi All,

I want to filter my result on table which have following structure,

id  | name   | dept_id | created_at
------------------------------------------------
1   | rahul    | 2           |  2009-12-11 01:31:18.43
2   | rahul1  | 2           |  2009-10-11 12:24:18.50
3   | rahul3  | 2           |  2009-11-11 11:54:18.34
4   | demo1 | 3           |  2009-10-11 07:45:18.26
5   | demo2 | 3           |  2009-12-11 12:46:18.44
6   | demo3 | 3           |  2009-11-11 09:36:18.36
7   | deo1    | 4           |  2009-11-11 08:51:18.41
8   | deo3    | 4           |  2009-12-11 05:26:18.44

In this structure I want to index only those records from a groups of
dept_id which have latest created_at date

OR you can say

distinct dept_id with latest created_at date.

For above scenario how can I specify a where condition into
define_index part of model.

or scope or any think which I can specify after index done.

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