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This gem provides some extra validations for ActiveModel objects.


Add this line to your application's Gemfile:

gem 'extra_validations'

And then execute:

$ bundle

Or install it yourself as:

$ gem install extra_validations


The following validators are available:

Collection length:

validates :attr, collection_length: { in: 1..5 }

Collection members validator (ensures that each member of the collection is valid):

validates :attr, collection: true

Existence validator:

validates :model_id, existence: ->(value) { Model.exists?(value) }

Nested validator (ensures that the object is valid):

validates :model, nested: true


After checking out the repo, run bin/setup to install dependencies. Then, 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 to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.


  1. Fork it ( https://github.com/estoulendo/extra_validations/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request