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-rw-r--r--activerecord/lib/active_record/locking/optimistic.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/locking/optimistic.rb b/activerecord/lib/active_record/locking/optimistic.rb
index e9e8a44273..02cf565017 100644
--- a/activerecord/lib/active_record/locking/optimistic.rb
+++ b/activerecord/lib/active_record/locking/optimistic.rb
@@ -26,7 +26,7 @@ module ActiveRecord
super
base.extend ClassMethods
- base.cattr_accessor :lock_optimistically
+ base.cattr_accessor :lock_optimistically, :instance_writer => false
base.lock_optimistically = true
base.alias_method_chain :update, :lock