# AR::Check [![Travis-CI](https://travis-ci.org/fnando/ar-check.svg)](https://travis-ci.org/fnando/ar-check) [![Code Climate](https://codeclimate.com/github/fnando/ar-check/badges/gpa.svg)](https://codeclimate.com/github/fnando/ar-check) [![Test Coverage](https://codeclimate.com/github/fnando/ar-check/badges/coverage.svg)](https://codeclimate.com/github/fnando/ar-check/coverage) [![Gem](https://img.shields.io/gem/v/ar-check.svg)](https://rubygems.org/gems/ar-check) [![Gem](https://img.shields.io/gem/dt/ar-check.svg)](https://rubygems.org/gems/ar-check) Enable PostgreSQL's CHECK constraints on ActiveRecord migrations. ## Installation Add this line to your application's Gemfile: ```ruby gem "ar-check" ``` And then execute: $ bundle Or install it yourself as: $ gem install ar-check ## Usage To create a `CHECK` constraint, just use the method `add_check`. ```ruby create_table :employees do |t| t.integer :salary, null: false end add_check :employees, :positive_salary, "salary > 0" ``` This will generate a new constraint using the following SQL statement: ```sql ALTER TABLE employees ADD CONSTRAINT positive_salary_on_things CHECK (salary > 0) ``` To remove it, just using `remove_check`. ```ruby remove_check :employees, :positive_salary ``` ## Development After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` 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](https://rubygems.org). ## Contributing Bug reports and pull requests are welcome on GitHub at https://github.com/fnando/ar-check. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](contributor-covenant.org) code of conduct. ## License The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).