diff --git a/guides/source/active_record_querying.textile b/guides/source/active_record_querying.textile index 294ef25b33e6d..eceeb814fdcba 100644 --- a/guides/source/active_record_querying.textile +++ b/guides/source/active_record_querying.textile @@ -259,6 +259,54 @@ SELECT * FROM clients WHERE (clients.id IN (1,10)) WARNING: Model.find(array_of_primary_key) will raise an +ActiveRecord::RecordNotFound+ exception unless a matching record is found for all of the supplied primary keys. +h5. take + +Model.take(limit) retrieves the first number of records specified by +limit+ without any explicit ordering: + + +Client.take(2) +# => [#, + #] + + +The SQL equivalent of the above is: + + +SELECT * FROM clients LIMIT 2 + + +h5. first + +Model.first(limit) finds the first number of records specified by +limit+ ordered by primary key: + + +Client.first(2) +# => [#, + #] + + +The SQL equivalent of the above is: + + +SELECT * FROM clients LIMIT 2 + + +h5. last + +Model.last(limit) finds the number of records specified by +limit+ ordered by primary key in descending order: + + +Client.last(2) +# => [#, + #] + + +The SQL equivalent of the above is: + + +SELECT * FROM clients ORDER By id DESC LIMIT 2 + + h4. Retrieving Multiple Objects in Batches We often need to iterate over a large set of records, as when we send a newsletter to a large set of users, or when we export data.