PgAdvisoryLock

Postgresql Advisory Lock for ActiveRecord. Allows to use mutex in applications that uses same database.

Installation

Add this line to your application's Gemfile:

gem 'pg_advisory_lock'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install pg_advisory_lock

Usage

create subclass from PgAdvisoryLock::Base and define model_class for it

class MySqlCaller < PgAdvisoryLock::Base
  model_class 'ApplicationRecord'
end

MySqlCaller.select_values 'SELECT id from users WHERE parent_name = ?', 'John Doe' # => [1, 2, 3]

or just define model_class for PgAdvisoryLock::Base itself

PgAdvisoryLock::Base.model_class 'ApplicationRecord'

PgAdvisoryLock::Base.select_values 'SELECT id from users WHERE parent_name = ?', 'John Doe' # => [1, 2, 3]

Development

After checking out the repo, run bin/setup to install dependencies. Create spec/config/database.yml (look at spec/config/database.example.yml for example). You need to create test database, so run psql -c 'CREATE DATABASE pg_advisory_lock_test;'. 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/didww/pg_advisory_lock. 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 PgAdvisoryLock project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.