Hi, its a bug in SDN, I fixed it here, in case you want to patch locally.
https://github.com/spring-projects/spring-data-neo4j/blob/master/spring-data-neo4j/src/main/java/org/springframework/data/neo4j/support/conversion/ResultColumnValueExtractor.java#L75 if (returnType.isCollectionLike()) { QueryResultBuilder qrb = new QueryResultBuilder((Iterable)columnValue, converter); return qrb.to(returnType.getActualType().getType()).as(returnType.getType()); } else return converter.convert(columnValue, returnType.getType(), mappingPolicy); } It will be part of the next release, thanks again for reporting it. Cheers Michael Am 09.01.2014 um 09:13 schrieb Gwendal Mousset <[email protected]>: > A precision i missed, the exception is not thrown when i execute the request > but when i try accessing to Iterable<CategoryDAO> getSubCategories(). > > > On Wednesday, January 8, 2014 1:47:18 PM UTC+1, Gwendal Mousset wrote: > Hello, > > I have an issue with cypher request using collect() function. > I'm using spring-data-neo4j 3.0.0-M1 and Neo4j 2.0.0-M06. > > In my data model i have Category nodes. > Each category can have subcategories. > I want to retrieve the top categories list with the associated subcategories. > > Categ3 -- IS_SUBCATEGORY_OF --> Categ1 <-- IS_SUBCATEGORY_OF -- Categ2 > > My request: > > MATCH (cat:Category) > WITH cat > MATCH (cat)<-[?:IS_SUBCATEGORY_OF]-(subCat:Category) > WHERE NOT cat-[:IS_SUBCATEGORY_OF]->() > RETURN cat as category, collect(subCat) as subCategories > > > The query result is exactly what i expect in the console: > > +--------------------------------------------------------------------------------------------------------------------------------------------------------+ > | category | subCategories > | > +--------------------------------------------------------------------------------------------------------------------------------------------------------+ > | Node[128]{id:"e9c27555f46c4acdb29c8d0e89814467"} | [] > | > | Node[176]{id:"78f7c907068c4e1abd018fe560c2c03a"} | [] > | > | Node[134]{id:"e362b9c05a8f41f0aee877f914f2658f"} | [] > | > | Node[136]{id:"7b3d58a89ebd4010964004d58e962526"} | [] > | > | Node[118]{id:"3378af0b1f54405fb7ab2970cba5bff3"} | > [Node[34]{id:"d10cc4418c914c1281f7183da8109a4f"},Node[46]{id:"b3012831db924c22829a0335df2e90d1"}] > | > | Node[130]{id:"e3e290b4d2c648b3a6a7d0fe8da461ef"} | [] > | > | Node[138]{id:"eb828c120cb248c2a5baa92734e39b91"} | [] > | > | Node[132]{id:"057aeb6913474454a329571b9a266305"} | [] > | > | Node[126]{id:"2671039fa6f24f5b806df682c238d1c4"} | > [Node[120]{id:"48bc7f2b34db49bfb40936864a7a4a80"},Node[122]{id:"373d94527286482fb8c807aee90d7f5e"}] > | > +--------------------------------------------------------------------------------------------------------------------------------------------------------+ > > > My QueryResult interface: > > @QueryResult > public interface CategoryWithSubCategories { > > > /** > * > * @return A category. > */ > @ResultColumn("category") > CategoryDAO getCategory(); > > /** > * > * @return The subcategories. > */ > @ResultColumn("subCategories") > Iterable<CategoryDAO> getSubCategories(); > } > > My Query: > > @Query("MATCH (cat:Category) " > + "WITH cat " > + "MATCH (cat)<-[?:IS_SUBCATEGORY_OF]-(subCat:Category) " > + "WHERE NOT cat-[:IS_SUBCATEGORY_OF]->() " > + "RETURN distinct cat as category, collect(subCat) as subCategories") > Iterable<CategoryDAO> getAll(); > > When i call this method, i get an exception: > > java.lang.RuntimeException: Cannot extract single value from Iterable with > more than one elements. > at > org.springframework.data.neo4j.conversion.DefaultConverter.extractSingle(DefaultConverter.java:60) > at > org.springframework.data.neo4j.conversion.DefaultConverter.extractValue(DefaultConverter.java:51) > at > org.springframework.data.neo4j.conversion.DefaultConverter.convert(DefaultConverter.java:40) > at > org.springframework.data.neo4j.support.conversion.EntityResultConverter.convert(EntityResultConverter.java:165) > at > org.springframework.data.neo4j.conversion.DefaultConverter.convert(DefaultConverter.java:36) > at > org.springframework.data.neo4j.rest.SpringRestGraphDatabase$SpringResultConverter.convert(SpringRestGraphDatabase.java:148) > at > org.neo4j.rest.graphdb.util.QueryResultBuilder$1$1.underlyingObjectToObject(QueryResultBuilder.java:98) > at org.neo4j.helpers.collection.IteratorWrapper.next(IteratorWrapper.java:47) > ... > ... > > > I think my code is quite similar with the exemple in documentation at > http://docs.spring.io/spring-data/data-neo4j/docs/3.0.0.M1/reference/htmlsingle/#reference_programming-model_mapresult > > Please could you tell me what i'm doing wrong ? > > Tank you > > > > -- > You received this message because you are subscribed to the Google Groups > "Neo4j" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "Neo4j" group. 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