create.rb

require 'disposable/twin/struct'
require 'trailblazer/operation/model'
require 'reform/form/dry'

module User
  class Create < Trailblazer::Operation
    include Model
    model ::User::Persistence, :create

    contract do
      include Reform::Form::Dry
      property :name

      validation :default do
        key(:name, &:filled?)
      end
    end

    def process(params)
      validate(params) do
        model.save
      end
    end
  end
end