AR::Check

Enable PostgreSQL's CHECK constraints on ActiveRecord migrations.

Installation

Add this line to your application's Gemfile:

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.

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:

ALTER TABLE employees
ADD CONSTRAINT positive_salary_on_things
CHECK (salary > 0)

To remove it, just using remove_check.

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.

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 code of conduct.

License

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