MongoDB with Morphia's Details

Morphia Grammar

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Update arrays of embedded documents

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We can use "key.index.key" to locate the values in the array which we intend to modify.

Query query = BallMongoUtils.datastore.createQuery(Ball.class).disableValidation().

field(Mapper.ID_KEY).equal(newObjectId("583646cacd8ba00e54188f73"));

UpdateOperations updateOperations =

BallMongoUtils.datastore.createUpdateOperations(Ball.class)

    .disableValidation()

    .set("newField.0.num","10");

//BallMongoUtils.datastore.createUpdateOperations(Ball.class)

//  .disableValidation()

//  .set("newField."+1+".num","11");

BallMongoUtils.datastore.update(query,updateOperations);

The document below

// colleciton: Ball

{

"_id" : ObjectId("583646cacd8ba00e54188f73"),

"className" : "com.me.entity.Ball",

"name" : "FOUR",

"radius" : 12.45,

"colour" : "6e10f4",

"number" : "10",

"status" : "disable",

"newField" : [

     {

         "num" : "10",

          "name" : "aaa"

     },

     {

          "num" : "11",

          "name" : "bbb"

}

}

}

Update: set a list of embedded documents

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First, a List Object was essential .Got it from the Query:

Then set this list into another document: