Spring Data Neo4J – My Shitty Code https://myshittycode.com Embracing the Messiness in Search of Epic Solutions Fri, 06 Jan 2023 16:38:37 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.3 https://myshittycode.com/wp-content/uploads/2022/04/cropped-icon-32x32.png Spring Data Neo4J – My Shitty Code https://myshittycode.com 32 32 205304208 Spring Data Neo4J: Requested a entity of type ‘X’, but the entity is of type ‘Y’ https://myshittycode.com/2015/08/19/spring-data-neo4j-requested-a-entity-of-type-x-but-the-entity-is-of-type-y/ https://myshittycode.com/2015/08/19/spring-data-neo4j-requested-a-entity-of-type-x-but-the-entity-is-of-type-y/#respond Wed, 19 Aug 2015 20:53:49 +0000 http://myshittycode.com/?p=805 PROBLEM Let’s assume we have a node entity like this:- When saving this entity, we get this exception:- SOLUTION This problem occurs because relationship likes is being used by both Restaurant entity and Beverage entity. To fix it, we need to enforce the target type.

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]]> PROBLEM

Let’s assume we have a node entity like this:-

@NodeEntity
public final class Person {
    @GraphId
    private Long id;

    private String name;

    @Fetch
    @RelatedTo(type = "likes", direction = OUTGOING)
    public Set<Restaurant> likesRestaurants;

    @Fetch
    @RelatedTo(type = "likes", direction = OUTGOING)
    public Set<Beverage> likesBeverages;

    public Person() {
    }

    public Person(final String name,
                  final Set<Restaurant> likesRestaurants,
                  final Set<Beverage> likesBeverages) {
        this.name = name;
        this.likesRestaurants = likesRestaurants;
        this.likesBeverages = likesBeverages;
    }
}

When saving this entity, we get this exception:-

Exception in thread "main" org.springframework.data.neo4j.mapping.PersistentEntityConversionException:
Requested a entity of type 'class myproject.Restaurant',
but the entity is of type 'class myproject.Beverage'.

SOLUTION

This problem occurs because relationship likes is being used by both Restaurant entity and Beverage entity.

To fix it, we need to enforce the target type.

@NodeEntity
public final class Person {
    @GraphId
    private Long id;

    private String name;

    @Fetch
    @RelatedTo(type = "likes", direction = OUTGOING, enforceTargetType = true)
    public Set<Restaurant> likesRestaurants;

    @Fetch
    @RelatedTo(type = "likes", direction = OUTGOING, enforceTargetType = true)
    public Set<Beverage> likesBeverages;

    public Person() {
    }

    public Person(final String name,
                  final Set<Restaurant> likesRestaurants,
                  final Set<Beverage> likesBeverages) {
        this.name = name;
        this.likesRestaurants = likesRestaurants;
        this.likesBeverages = likesBeverages;
    }
}

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