Hi guys,
I have a quick question. I am new to Neo4j and I am having some problems to
figure out what is the retrieval order for collections in Neo4j.
My example is pretty easy, I have a Person class which defines a Collection
of Addresses as follow:
@Data
@NodeEntity
@AllArgsConstructor
@EqualsAndHashCode(of = "name")
public class Person {
@GraphId
private Long id;
private String name;
@Relationship(type = "LIVES_IN")
private List<Address> addresses = new ArrayList<>();
}
Address Class is simple as:
@Data
@NodeEntity
@AllArgsConstructor
@ToString(of = "name")
@EqualsAndHashCode(of = "name")
public class Address {
@GraphId
private Long id;
private String name;
}
The problem i am facing is basically that the order of the address
collections when I load a Person is not the same as the order I added the
address into the collection.
Person p = new Person(null, "Person", new ArrayList());
Address a1 = new Address(null, "Address 1");
Address a2 = new Address(null, "Address 2");
Address a3 = new Address(null, "Address 3");
p.add(a1);
p.add(a2);
p.add(a3);
personRepository.save(p);
Person person = personRepository.findOne(p.getId());
person.getAddresses().stream().forEach(System.out::println);
The result I am getting after running this code is:
Address(name=Address 2)
Address(name=Address 1)
Address(name=Address 3)
Is there any way to preserve the insertion order?
The example can be found
here: https://github.com/mmonti/neo4j-person-address
Thanks.
M.-
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