Nested Collections with MongoItemWriter [BATCH-2419]

[spring-projects-issues]

Ajit Pendse opened BATCH-2419 and commented

While using MongoItemWriter with a custom item processor generating List<Item>, writer receives a nested list as List<List<Item>>. This later fails while trying to convert this list into a BasicDBObject (through MongoTemplate.save() method).

Specifically, the toDbObject() method of MontoTemplate tries to use MappingMongoConverter to convert each List<Item> into BasicDBObject and fails. Ideally, this can be auto-detected and unwrapped to write out individual 'Item's instead of trying to convert the List into BasicDBObject.

As a work-around, a custom converter may work with MongoMappingConverter.

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Affects: 3.0.4

[spring-projects-issues]

Ajit Pendse commented

May be related to DATAMONGO-1274 - found while debugging the root cause of this issue.