From 5559a2ae98dcda6854f38890025b52edfb2836f5 Mon Sep 17 00:00:00 2001 From: Vijay Dev Date: Wed, 30 May 2012 22:29:02 +0530 Subject: Revert "[AR querying guide] Add examples for take(limit), first(limit) and last(limit)" This reverts commit 724d6fa6bb48b61798c223b47dd27155839c40d5. Reason: This is already documented in another section, albeit without the arguments examples. Let's add them in another commit in the appropriate sections [ci skip] --- guides/source/active_record_querying.textile | 48 ---------------------------- 1 file changed, 48 deletions(-) diff --git a/guides/source/active_record_querying.textile b/guides/source/active_record_querying.textile index eceeb814fd..294ef25b33 100644 --- a/guides/source/active_record_querying.textile +++ b/guides/source/active_record_querying.textile @@ -259,54 +259,6 @@ 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. -- cgit v1.2.3