Add this line to your application's Gemfile:

gem 'easy_params'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install easy_params


# app/params/api/v2/icqa/move_params.rb
class Api::V1::Carts::MoveParams < EasyParams::Base
  attribute :receive_cart_id, integer
  attribute :i_am_sure, bool
  attribute :location_code, string.default('')
  attribute :sections, struct do
    attribute :from, string
    attribute :to, string
  attribute :options, array.of(struct) do
    attribute :option_type_count, integer
    attribute :option_type_value, integer

    validates :option_type_count, :option_type_value, presence: { message: "can't be blank" }

  validates :receive_cart_id, :location_code, presence: { message: "can't be blank" }

Validation messages for nested attributes will look like this.


Optionally you can use more compact form

class MyParams < EasyParams::Base
  extend EasyParams::DSL

  quantity integer.default(1)
  posts each do
    content string.default('')
  user has do
    role string

More examples here params_spec.rb


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]/easy_params. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.


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

Code of Conduct

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