Issue
Background I am trying to figure out the correct way to add a UUID to neo4j if I am using Spring Data.
I have seen:
https://dzone.com/articles/assigning-uuids-neo4j-nodes
and here a TransactionEventHandler is used to insert a UUID when necessary. But the person who made this tutorial was not using spring data.
I have also seen this person's code: https://github.com/spring-projects/spring-data-neo4j/blob/master/spring-data-neo4j/src/test/java/org/springframework/data/neo4j/web/domain/User.java They seem to be using java's java.util.UUID and then just converting it to a string and using it as a string entity and indexing it and going from there. This seems to be the simplest way.
But, in the docs: https://docs.spring.io/spring-data/neo4j/docs/current/reference/html/ They seem to using UUID's as their example for a usecase of an AddUuidPreSaveEventListener
Questions
Which method should I use for adding UUID's?
Could I just add
...
import java.util.UUID;
import org.neo4j.ogm.annotation.Index;
import org.neo4j.ogm.annotation.typeconversion.Convert;
import org.neo4j.ogm.typeconversion.UuidStringConverter;
...
@Convert(UuidStringConverter.class)
@Index(unique = true, primary = true)
private UUID uuid = UUID.randomUUID();
...
to my GraphType.java file and call it good?
Note: I am very new to all these technologies and could be still too inexperienced to even properly ask a question on this stuff.
Note 2: I have seen the graphaware UUID library before, it does seem to be fairly up to date, but I assumed that there may be a preferred way to make UUIDs if I was working with spring data.
Solution
You can use the GraphAware Neo4j UUID library.
The docs says:
GraphAware UUID is a simple library that transparently assigns a UUID to newly created nodes and relationships in the graph and makes sure nobody can (accidentally or intentionally) change or delete them.
Simply download GraphAware Neo4j Framework and GraphAware Neo4j UUID .jar files to /plugins directory, modify few lines in neo4j.conf file and restart Neo4j. After it, UUIDs will be assigned to each node / relationships created in the Neo4j graph.
This approach does not depends on Spring or Spring Data.
Answered By - Bruno Peres
