activerecord - Limit the number of records in table in Rails -

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I want to keep a table in the rail, to limit the number of records. If I have a notification table, So how can I work to keep only 50 records at a time? Therefore, if any new record is added then first is removed and new one is saved as 50th.

Is there a good rail system to do it automatically or do I have to implement it manually? When I am creating a new information?

I think it is very easy to implement itself. / P>

1 liner 

  notification. First.destroy if notification count & gt; 50   
 Use it in  first / create>  callback

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