How do I GroupBy in Spring Data Mongodb without Aggregation?

Question

I have a data like below, and I want to group that data by the type, I'm using spring-data-mongodb .

[
    {
        "_id" : ObjectId("58a5518aace6132a88309d98"),
        "type" : "SMS",
    },
    {
        "_id" : ObjectId("58a5518bace6132a88309d99"),
        "type" : "PUSH_NOTIFICATION",
    },
    {
        "_id" : ObjectId("58a5519aace6132a0094d7df"),
        "type" : "SMS",
    },
    {
        "_id" : ObjectId("58a5519aace6132a0094d7e0"),
        "type" : "PUSH_NOTIFICATION",
    }
]

I'm using this method and won't work.

GroupByResults<Queuing> results = mongoTemplate.group("queuing",
                GroupBy.key("type"), Queuing.class);

Anyone know the best and clear way to do this grouping using spring-data-mongodb.

Thanks.

s7vr · Accepted Answer · 2017-02-17 13:41:02Z

2

This is the correct syntax for group operation.

GroupByResults<Queuing> results = mongoTemplate.group("queuing",
            GroupBy.key("type").initialDocument("{}").reduceFunction("function(doc, prev) {}"),
            Queuing.class);

More information here http://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#mongo.group.example

answered Feb 17, 2017 at 13:41

s7vr

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