From 724d6fa6bb48b61798c223b47dd27155839c40d5 Mon Sep 17 00:00:00 2001
From: Rafael Magana <raf.magana@gmail.com>
Date: Mon, 28 May 2012 11:20:13 -0500
Subject: [AR querying guide] Add examples for take(limit), first(limit) and
 last(limit)

---
 guides/source/active_record_querying.textile | 48 ++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/guides/source/active_record_querying.textile b/guides/source/active_record_querying.textile
index 294ef25b33..eceeb814fd 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: <tt>Model.find(array_of_primary_key)</tt> will raise an +ActiveRecord::RecordNotFound+ exception unless a matching record is found for <strong>all</strong> of the supplied primary keys.
 
+h5. take
+
+<tt>Model.take(limit)</tt> retrieves the first number of records specified by +limit+ without any explicit ordering:
+
+<ruby>
+Client.take(2)
+# => [#<Client id: 1, first_name: "Lifo">, 
+      #<Client id: 2, first_name: "Raf">]
+</ruby>
+
+The SQL equivalent of the above is:
+
+<sql>
+SELECT * FROM clients LIMIT 2
+</sql>
+
+h5. first
+
+<tt>Model.first(limit)</tt> finds the first number of records specified by +limit+ ordered by primary key:
+
+<ruby>
+Client.first(2)
+# => [#<Client id: 1, first_name: "Lifo">, 
+      #<Client id: 2, first_name: "Raf">]
+</ruby>
+
+The SQL equivalent of the above is:
+
+<sql>
+SELECT * FROM clients LIMIT 2
+</sql>
+
+h5. last
+
+<tt>Model.last(limit)</tt> finds the number of records specified by +limit+ ordered by primary key in descending order:
+
+<ruby>
+Client.last(2)
+# => [#<Client id: 10, first_name: "Ryan">, 
+      #<Client id: 9, first_name: "John">]
+</ruby>
+
+The SQL equivalent of the above is:
+
+<sql>
+SELECT * FROM clients ORDER By id DESC LIMIT 2
+</sql>
+
 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