ValidateMyParams

ValidateMyParams is a tiny ruby library that can be used in any project that needs parameters validation for methods. It is heavily inspired by this Airbnb blog post. As the blog post puts it, it's better to validate and fail fast, than let bugs crawl into production.

The library consists of a single module that can be included in your classes, allowing you to validate the parameters passed (as a hash / keyword params) to any method.

Add this line to your application's Gemfile:

gem 'validate_my_params'

And then execute:

$ bundle

Or install it yourself as:

$ gem install validate_my_params

Let's say that you have a Person class and want to validate the params passed to a method of this class. All you have to do is include the ValidateMyParams module, which gives you access to 2 methods: validate_args and validate. Let's see an example:

class Person
  include ValidateMyParams
  
  def initialize(params)
    validate_args(params) do
      validate :name, type: String, required: true
      validate :age, type: Integer, required: false
    end
  end
end

That's it! If the parameters validation rules don't pass, the method will raise a relevant exception ValidateMyParams::MissingParam or ValidateMyParams::InvalidParam, so you can catch bugs with invalid params passed to your methods before they appear in production.

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.

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/validate_my_params. 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.

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

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