A patch to allow `neo4j` gem to retry when there's a `id_property` conflict.

example.rb

class Article
  include Neo4j::ActiveNode
  include IdPropertyWithRetry

  id_property :uuid, on: :id_builder, retry: 3

  def id_builder
    SecureRandom.urlsafe_base64(8)
  end
end

Article.new.save
# =>  Article 18ms MATCH (n:`Article`) WHERE (n.uuid = {n_uuid}) RETURN n | {:n_uuid=>"conflicting_uuid"}
# =>  Article 18ms MATCH (n:`Article`) WHERE (n.uuid = {n_uuid}) RETURN n | {:n_uuid=>"valid_uuid"}
# =>  CYPHER 4ms CREATE (n:`Article` {props}) RETURN ID(n) | {:props=>{:uuid=>"valid_uuid"}}

id_property_with_retry.rb

module IdPropertyWithRetry
  extend ActiveSupport::Concern

  module ClassMethods
    def id_property(name, conf = {})
      conf[:on] = define_retry_methods(conf[:on], conf[:retry]) if conf[:on] && conf[:retry]
      super
    end

    private

    def define_retry_methods(name, times)
      alias_name = :"#{name}_with_retry"
      define_method(alias_name) do
        counter = 0
        generated = __send__(name)
        while counter < times && self.class.as(:n).where(uuid: generated).any?
          counter += 1
          generated = __send__(name)
        end
        generated
      end
      alias_name
    end
  end
end