_spira_factory_bot_helper.rb

# frozen_string_literal: true
module FactoryBot
  module Syntax
    module Default
      class DSL
        def spira_factory(name, options = {}, &block)
          factory(name, options) do
            instance_eval do
              initialize_with do
                RDF::Graph.new.tap do |g|
                  Spira.using_repository(g) do
                    new(attributes).save!
                  end
                end
              end
              instance_eval(&block) if block
            end
          end
        end
      end
    end
  end
end

user.rb

  module MyApp
    class User < ::Spira::Base
      configure base_uri: 'http://example.org/user'

      property :bob, predicate: RDF::Vocab::DC.title, type: String
    end
  end

user_factory.rb

FactoryBot.define do
  spira_factory :user, class: MyApp::User do
    name { 'Bob' }
  end
end