is it garanteed that there is no duplicate records about randumb HOT 5 CLOSED

Your code looks correct and no, there shouldn't be any duplicates :)

from randumb.

Thanks!

On Sun, Dec 4, 2011 at 9:26 AM, spilliton <
[email protected]

wrote:

Your code looks correct and no, there shouldn't be any duplicates :)

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#3 (comment)

from randumb.

Thank you, is it faster than questions_of_quota.sort_by{rand}[1..10] ?

from randumb.

In instances where your data set is very very small, retrieving all of your data (like in your example), and then doing sort_by, I believe will be faster because my gem does 2 DB queries instead of 1. However, if you have a very large data set, and questions_of_quota.all returns 100 or so records, then my gem is much faster because it doesn't have to serialize 100 objects only to throw away 90 of them that you aren't going to use :)

It does this by doing one query to only obtain the ID's of the matching records, then randomly choosing the from that set of IDs, then fetching the records using those ID's

from randumb.

thanks for explanation

from randumb.