java - MongoDB query update nested list of objects -

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i have users table in mongodb format looks this:

{     "_id" : objectid("id"),     "user" : {                  "id" : "userid",                  "info" : "user info",                  "subscriptions" : [                         {                             "subname" : "sub1",                             "frequency" : 1,                             "contentid" : "contentid"                         }                  ]              } }

i add subscription object array named "subscriptions." here code looks , doesn't work. jsonparser in case work , returns correct array.

querybuilder builder = querybuilder.start("user.id").is("userid"); dbcursor cursor = mongoclient.find(builder.get())  while (cursor.hasnext()){     dbobject user = cursor.next();     basicdblist subscriptions = (basicdblist)jsonparser.parseobject(user, "user.subscriptions");      subscriptions.add(subscriptiondbobject);      dbobject updatesubs = new basicdbobject();     updatesubs.put("$set", new basicdbobject("subscriptions" : subscriptions);      mongoclient.update(user, updatesubs); }

this runs user never edited , writeresult returns "updatedexisting" : false. appreciate if tell me have done wrong here.

thanks

i'm not familiar java driver, won't suggest code, believe looking mongo's array update operators. think $push or $addtoset operator serve needs.

mongo's example using $push:

db.students.update(    { _id: 1 },    { $push: { scores: 89 } } )

be sure understand performance implications of using growing embedded arrays in mongodb. see here: why shouldn't embed large arrays in documents?

you might find post helpful: thinking arrays in mongodb


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