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This is a set of extensions for PORO objects to help in data coercion and validation. It was extracted from rom-rails and for now it uses Virtus and ActiveModel.

The package includes:

  • ROM::Attributes for defining input attributes with types and coercion rules
  • ROM::Validator a standalone validator object extension built on top of ActiveModel::Validations with additional features like nested validators

The Plan™

This gem is built on top of existing 3rd party gems that have proven to be stable and good-enough. Unfortunately neither Virtus nor ActiveModel do not meet certain design requirements to be a good fit in the long term.

For that reason we're exploring how to build a better foundation for rom-model. Specifically following initiatives are taking place:

  • Exploring a lower-level validation library with great composability features and simple interface
  • Investigating a lower-level input data sanitization/coercion library that would be a perfect fit for handling web forms and json input

Furthermore rom-model will be soon extended with a third extension for defining Algebraic Data Types which will work remarkably well with rom-repository and its auto-mapping features.

This project will provide convenient interfaces on top of robust lower-level tools and if it turns out to be too big we'll split it into smaller gems.


Add this line to your application's Gemfile:

gem 'rom-model'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rom-model


See LICENSE file.