class IncludesCombinationsValidation < Validation
  def self.validate(params, field, name, value, record, errors)
    combinations = params['combinations']
    combinations.each do |included_combination|
      return if included_combination.all? {|required| value.include?(required)}
    end
    errors[field.name] << new(combinations)
  end

  def describe
    combinations = params.collect(&:to_s).join(', ')
    "must contain one of these combinations: #{combinations}"
  end
end