From 410fa4cf7c710ff062c59c1c90357729c418be65 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20Ba=CC=88uerlein?= <fabrik42@gmail.com>
Date: Fri, 14 Oct 2011 16:28:02 +0200
Subject: Includes stale record in StaleObjectError

---
 activerecord/lib/active_record/errors.rb             |  9 +++++++++
 activerecord/lib/active_record/locking/optimistic.rb |  4 ++--
 activerecord/test/cases/locking_test.rb              | 19 ++++++++++++++++++-
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/activerecord/lib/active_record/errors.rb b/activerecord/lib/active_record/errors.rb
index 96870cb338..950fc7356c 100644
--- a/activerecord/lib/active_record/errors.rb
+++ b/activerecord/lib/active_record/errors.rb
@@ -99,6 +99,15 @@ module ActiveRecord
   #
   # Read more about optimistic locking in ActiveRecord::Locking module RDoc.
   class StaleObjectError < ActiveRecordError
+    attr_reader :record
+
+    def initialize(record)
+      @record = record
+    end
+
+    def message
+      "Attempted to update a stale object: #{record.class.name}"
+    end    
   end
 
   # Raised when association is being configured improperly or
diff --git a/activerecord/lib/active_record/locking/optimistic.rb b/activerecord/lib/active_record/locking/optimistic.rb
index d9ad7e4132..cafe48cff6 100644
--- a/activerecord/lib/active_record/locking/optimistic.rb
+++ b/activerecord/lib/active_record/locking/optimistic.rb
@@ -103,7 +103,7 @@ module ActiveRecord
             affected_rows = connection.update stmt
 
             unless affected_rows == 1
-              raise ActiveRecord::StaleObjectError, "Attempted to update a stale object: #{self.class.name}"
+              raise ActiveRecord::StaleObjectError, self
             end
 
             affected_rows
@@ -127,7 +127,7 @@ module ActiveRecord
             affected_rows = self.class.unscoped.where(predicate).delete_all
 
             unless affected_rows == 1
-              raise ActiveRecord::StaleObjectError, "Attempted to delete a stale object: #{self.class.name}"
+              raise ActiveRecord::StaleObjectError, self
             end
           end
 
diff --git a/activerecord/test/cases/locking_test.rb b/activerecord/test/cases/locking_test.rb
index 61baa55027..e9bd7f07b6 100644
--- a/activerecord/test/cases/locking_test.rb
+++ b/activerecord/test/cases/locking_test.rb
@@ -125,6 +125,24 @@ class OptimisticLockingTest < ActiveRecord::TestCase
     assert_raise(ActiveRecord::StaleObjectError) { p2.save! }
   end
 
+  def test_lock_exception_record
+    p1 = Person.new(:first_name => 'mira')
+    assert_equal 0, p1.lock_version
+
+    p1.first_name = 'mira2'
+    p1.save!
+    p2 = Person.find(p1.id)
+    assert_equal 0, p1.lock_version
+    assert_equal 0, p2.lock_version
+
+    p1.first_name = 'mira3'
+    p1.save!
+
+    p2.first_name = 'sue'
+    error = assert_raise(ActiveRecord::StaleObjectError) { p2.save! }
+    assert_equal(error.record.object_id, p2.object_id)
+  end
+
   def test_lock_new_with_nil
     p1 = Person.new(:first_name => 'anika')
     p1.save!
@@ -141,7 +159,6 @@ class OptimisticLockingTest < ActiveRecord::TestCase
     assert_equal 1, p1.lock_version
   end
 
-
   def test_lock_column_name_existing
     t1 = LegacyThing.find(1)
     t2 = LegacyThing.find(1)
-- 
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