Hi, Michael, your patch works well with embedded database but not with neo4j server. Thanks for your help
Gwendal On Friday, January 10, 2014 10:23:27 AM UTC+1, Gwendal Mousset wrote: > > Thank you very much Michael for your work and your reactivity ! > > On Friday, January 10, 2014 9:26:46 AM UTC+1, Michael Hunger wrote: >> >> 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. 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.
