Building a FormObject by using dry-rb.org

form_object.rb

class FooForm < Dry::Struct
  constructor_type(:schema)

  module Types
    include Dry::Types.module
  end

  attribute :title, Types::Coercible::String
  attribute :location, Types::Coercible::String
  attribute :description, Types::Coercible::String
  attribute :date, Types::Form::DateTime


  def save
    errors = Schema.call(to_hash).messages(full: true)
    raise CommandValidationFailed, errors if errors.present?
    MyModel.create!(to_hash)
    return errors
  end

  private
  Schema = Dry::Validation.Form do
    configure do
      config.messages_file = Rails.root.join('config/locales/errors.yml')
      config.messages = :i18n
    end

    required(:title).filled(:str?)
    required(:date).filled
    required(:location).maybe(:str?)
    required(:description).maybe(:str?)
  end
end