How to retrieve and remove embedded document spring data mongodb

Question

There I am stuck, how to remove embedded document in mongodb. I am using spring data mongodb criteria, I am doing it like the following:

// database

"_id" : ObjectId("55683d51e4b0b6050c5b0db7"),
    "_class" : "com.samepinch.domain.metadata.Metadata",
    "preferenceType" : "SHOPPING",
    "subtypes" : [
        {
            "_id" : ObjectId("55683d51e4b0b6050c5b0db6"),
            "leftValue" : "VEG",
            "rightValue" : "NON_VEG",
            "preferencePoint" : 0
        }
    ],
    "createdDate" : ISODate("2015-05-29T10:20:01.610Z"),
    "updatedDate" : ISODate("2015-05-29T10:20:01.610Z")


// query

mongoTemplate.updateMulti(new Query(),
                    new Update().pull("subtypes", Query.query(Criteria.where("subtypes._id").is(new objectId("55683d51e4b0b6050c5b0db6"))),Metadata.class);

What i am doing wrong? Thanks in advance!

Neo-coder · Accepted Answer · 2015-05-29 14:00:51Z

subtypes is in nested objects so you should first pass this in $elemMatch is matched first matching array elements of given conditions. Update query as :

db.updateMulti.update({"subtypes":{"$elemMatch":{"_id":ObjectId("55683d51e4b0b6050c5b0db6")}}},
{"$pull":{"subtypes":{"_id":ObjectId("55683d51e4b0b6050c5b0db6")}}})

this query pull exact matching array elements from subtypes array .

And with the help of this spring elemMatch ( not that much expertise in spring mongo ) I converted this query in spring format as below :

mongoTemplate.updateMulti(new Query( 
where("subtypes").elemMatch(where("_id").is(ew objectId("55683d51e4b0b6050c5b0db6"))).pull(
  pull("subtypes", Query.query(Criteria.where("_id").is(new objectId("55683d51e4b0b6050c5b0db6"))),Metadata.class
));

this above spring query not tested I hope you will convert mongo update query in spring mongo query format.

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