Rails select random record

Question

I don\'t know if I\'m just looking in the wrong places here or what, but does active record have a method for retrieving a random object?

Something like?

<         


        

Answer 1

Strongly Recommend this gem for random records, which is specially designed for table with lots of data rows:

https://github.com/haopingfan/quick_random_records

Simple Usage:

@user = User.random_records(1).take

---

All other answers perform badly with large database, except this gem:

1. quick_random_records only cost 4.6ms totally.

2. the accepted answer User.order('RAND()').limit(10) cost 733.0ms.

3. the offset approach cost 245.4ms totally.

4. the User.all.sample(10) approach cost 573.4ms.

Note: My table only has 120,000 users. The more records you have, the more enormous the difference of performance will be.

---

UPDATE:

Perform on table with 550,000 rows

1. Model.where(id: Model.pluck(:id).sample(10)) cost 1384.0ms

2. gem: quick_random_records only cost 6.4ms totally