From 98bfccbdb5c29060f5e042819669b7442b6cd56c Mon Sep 17 00:00:00 2001
From: Vijay Dev <vijaydev.cse@gmail.com>
Date: Thu, 17 May 2012 01:32:21 +0530
Subject: [PATCH] document the AR::Base#ids method introduced in 9307616 [ci
 skip]

---
 guides/source/active_record_querying.textile | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/guides/source/active_record_querying.textile b/guides/source/active_record_querying.textile
index a9cb424eaa..294ef25b33 100644
--- a/guides/source/active_record_querying.textile
+++ b/guides/source/active_record_querying.textile
@@ -1260,6 +1260,24 @@ with
 Client.pluck(:id)
 </ruby>
 
+h3. +ids+
+
++ids+ can be used to pluck all the IDs for the relation using the table's primary key.
+
+<ruby>
+Person.ids
+# SELECT id FROM people
+</ruby>
+
+<ruby>
+class Person < ActiveRecord::Base
+  self.primary_key = "person_id"
+end
+
+Person.ids
+# SELECT person_id FROM people
+</ruby>
+
 h3. Existence of Objects
 
 If you simply want to check for the existence of the object there's a method called +exists?+. This method will query the database using the same query as +find+, but instead of returning an object or collection of objects it will return either +true+ or +false+.