module Sequel::Plugins::OptimisticLocking

This plugin implements a simple database-independent locking mechanism to ensure that concurrent updates do not override changes. This is best implemented by a code example:

class Person < Sequel::Model
  plugin :optimistic_locking
end
p1 = Person[1]
p2 = Person[1]
p1.update(name: 'Jim') # works
p2.update(name: 'Bob') # raises Sequel::NoExistingObject

In order for this plugin to work, you need to make sure that the database table has a lock_version column that defaults to 0. To change the column used, provide a :lock_column option when loading the plugin:

plugin :optimistic_locking, lock_column: :version

This plugin relies on the instance_filters plugin.

Methods

Public Class

1. apply
2. configure

Classes and Modules

1. Sequel::Plugins::OptimisticLocking::InstanceMethods