Ruby on Rails/ActiveRecord 3.2.17 monkey patch for lock requests

README.md

This monkey patch allows you to use lock hints defined by AR-JDBC adapter for MSSQL with Rails 3.2.

It will not work with Rails 3.1 or 4. It might as well not work with anything else than MSSQL.

Not like it has to...

It will work with this fork, though.

active_record_association_lock_option.rb

# -*- encoding : utf-8 -*-
require 'active_record/associations/builder/association'
require 'active_record/associations/association_scope'

module ActiveRecord
  module Associations
    class AssociationScope #:nodoc:
      def scope
        scope = klass.unscoped
        scope = scope.extending(*Array.wrap(options[:extend]))

        # 13/03/2014 14:01 MP: we're adding an optional lock hint
        # for mssql to pick up while searching for a record.
        scope = scope.lock(options[:lock_hint]) if options[:lock_hint].present?

        # It's okay to just apply all these like this. The options will only be present if the
        # association supports that option; this is enforced by the association builder.
        scope = scope.apply_finder_options(options.slice(
          :readonly, :include, :order, :limit, :joins, :group, :having, :offset, :select))

        if options[:through] && !options[:include]
          scope = scope.includes(source_options[:include])
        end

        scope = scope.uniq if options[:uniq]

        add_constraints(scope)
      end
    end
  end
end

association_class = ActiveRecord::Associations::Builder::Association
association_class.descendants.each do |klass|
  klass.instance_eval { self.valid_options += [:lock_hint] }
end
association_class.instance_eval { self.valid_options += [:lock_hint] }