2019-05-06 20:24:23 +00:00
|
|
|
# frozen_string_literal: true
|
2019-05-06 21:42:21 +00:00
|
|
|
|
|
|
|
# ensure ActiveRecord's version has been required already
|
|
|
|
require 'active_record/locking/optimistic'
|
|
|
|
|
2019-05-06 20:24:23 +00:00
|
|
|
# rubocop:disable Lint/RescueException
|
|
|
|
module ActiveRecord
|
|
|
|
module Locking
|
|
|
|
module Optimistic
|
|
|
|
private
|
|
|
|
|
|
|
|
def _update_row(attribute_names, attempted_action = "update")
|
|
|
|
return super unless locking_enabled?
|
|
|
|
|
|
|
|
begin
|
|
|
|
locking_column = self.class.locking_column
|
|
|
|
previous_lock_value = read_attribute_before_type_cast(locking_column)
|
|
|
|
attribute_names << locking_column
|
|
|
|
|
|
|
|
self[locking_column] += 1
|
|
|
|
|
|
|
|
# Patched because when `lock_version` is read as `0`, it may actually be `NULL` in the DB.
|
2019-05-06 21:42:21 +00:00
|
|
|
possible_previous_lock_value = previous_lock_value.to_i == 0 ? [nil, 0] : previous_lock_value
|
2019-05-06 20:24:23 +00:00
|
|
|
|
|
|
|
affected_rows = self.class.unscoped._update_record(
|
|
|
|
arel_attributes_with_values(attribute_names),
|
|
|
|
self.class.primary_key => id_in_database,
|
|
|
|
locking_column => possible_previous_lock_value
|
|
|
|
)
|
|
|
|
|
|
|
|
if affected_rows != 1
|
|
|
|
raise ActiveRecord::StaleObjectError.new(self, attempted_action)
|
|
|
|
end
|
|
|
|
|
|
|
|
affected_rows
|
|
|
|
|
|
|
|
# If something went wrong, revert the locking_column value.
|
|
|
|
rescue Exception
|
|
|
|
self[locking_column] = previous_lock_value.to_i
|
|
|
|
raise
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|