ThreadSafeUniquenessRecord

Usage is raised by thread race when the first thread tries to create the record at the same time the second thread is trying to create exactly the same record because both threads are seen no such record in DB on find_by action by the passed attributes.

Rails implementation of create_or_find_by

In thread race when both of threads proceed after the passed uniqueness validation in model without raise of RecordInvalid error and one of the thread has committed the change in DB then the second thread fires the RecordNotUnique error with retry on the rescue.

The attempts limiter is required to prevent the infinite loop when tries to create the record which can't be found by the passed attributes but becomes a duplicate by any other attributes.

Installation

Add this line to your application's Gemfile:

gem 'thread_safe_uniqueness_record'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install thread_safe_uniqueness_record

Usage

model_klass: ActiveRecordModel
attributes: Hash of model instance attributes

ThreadSafeUniquenessRecord::FindOrCreateBy.call(model_klass: model_klass, attributes: attributes)

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/Mifrill/thread_safe_uniqueness_record. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the ThreadSafeUniquenessRecord project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.