Sha256: f87da6b165b2bdc0ee2e4cc8249a8574a620d6c52f686423741d0c55ce4c32dc
Contents?: true
Size: 1.44 KB
Versions: 44
Compression:
Stored size: 1.44 KB
Contents
# frozen_string_literal: true
require_dependency "renalware"
module Renalware
module TransactionRetry
extend ActiveSupport::Concern
included do
# Retry a transaction automatically when an ActiveRecord::PreparedStatementCacheExpired error
# is raised. This handles a specific scenario where there is a migration run during a deploy
# that changes one or more columns used in a cached PostgreSQL prepared statement.
# We rescue it here and retry (once) the txn to prevent users getting an error when they try
# to select/update data moments after the deploy.
#
# Do not use this for transactions with side-effects unless it is acceptable
# for these side-effects to occasionally happen twice.
#
# Note we define this method in the included block (not the class_methods block as you would
# expect) becuase in the latter case a client calling #transaction would get the including
# class's transaction method, not the overriding one defined here. Using 'included' allows
# use to get around this. See comments in
# https://github.com/rails/rails/blob/master/activesupport/lib/active_support/concern.rb
#
def self.transaction(*args, &block)
retried ||= false
super
rescue ActiveRecord::PreparedStatementCacheExpired
if retried
raise
else
retried = true
retry
end
end
end
end
end
Version data entries
44 entries across 44 versions & 1 rubygems