From: "Florian Aßmann" <florian.assmann@...>
Date: 2007-06-05T07:05:50+09:00
Subject: Re: Sequel: Get latest record of multiple

Hi Alin,

Am 04.06.2007 um 08:26 schrieb Alin Popa:

>> first of all I'd like to say that Sequel seems very promising, thank
>> you Sharon. I'm currently writing a threaded daemon and I can't
>> figure out how to build this SQL String.
>>
>> I have an array of category ids which I use to select import records:
>> db[:imports].filter :category_id => categories.map(:id)
>>
>> Since a category has multiple imports I only want the latest Import
>> before a Date X for each category. Is this even possible?
>
> Hi Florian,
>
> I think that you need a field in that table in which you have to  
> put the
> timestamp. Maybe this feature that you want is present in some  
> advanced
> RDBMS like Oracle/DB2 or maybe Postgresql.

I defined some methods in my Model that - hopefully - build me up the  
query, still needs to be tested though. As the moment I'm having  
sequence problems when I try to create Records... :(

Sincerely
Florian

P.S. I'm using PostgreSQL 8.1