Error querying entity with @IdClass

[francescopace]

I've an entity bean with @IdClass annotation (multiple id columns).
This kind of annotation is not well supported by this framework and every query will fail due to:

graphql-jpa-query/graphql-jpa-query-schema/src/main/java/com/introproventures/graphql/jpa/query/schema/impl/GraphQLJpaQueryDataFetcher.java

Line 190 in 82be5d5

SingularAttribute<?,?> idAttribute = entityType.getId(Object.class);

You should change that, to something like this:

        if(entityType.hasSingleIdAttribute()){
            SingularAttribute<?,?> idAttribute = entityType.getId(Object.class);
            ...
        }else{
            ...
        }

Alternatively you can delete that line and change query statement

graphql-jpa-query/graphql-jpa-query-schema/src/main/java/com/introproventures/graphql/jpa/query/schema/impl/GraphQLJpaQueryDataFetcher.java

Line 192 in 82be5d5

query.select(cb.count(root.get(idAttribute.getName())));

in

query.select(cb.count(root));

[igdianov]

Thank you for feedback and the tip. I will take a look at it tomorrow