ActiveModel::Validations::DuckType

Duck type validators for active model.

ActiveModel::Validations was sorely lacking a system to validate the type. To respect Ruby, duck type.

Installation

Add this line to your application's Gemfile:

gem 'active_model-validations-duck_type'

And then execute:

$ bundle

Or install it yourself as:

$ gem install active_model-validations-duck_type

Usage

    class Person
      include ActiveModel::Validations

      attr_accessor :pet

      validates :pet, duck_type: { all: %i[house food] }
    end

    person = Person.new
    person.pet = 'house'
    person.valid?  # => false
    
    class Parrot
      attr_accessor :house, :food
    end
    
    person.pet = Parrot.new
    person.valid?  # => true

Contributing

Bug reports and pull requests are welcome on GitHub.

License

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