Cannot $push document

[stephanos]

I tried to 'push' a document to an array of an existing document:

AppCol

        .where(_._id eqs id)
        .modify(_.team.subfield(_.size) inc 1)
        .modify(_.team.subfield(_.members) push member)

        .updateOne(SAFE)

member is of type 'BsonRecord'. So the code above compiles without a problem but at runtime the following happens:

    json can't serialize type : class com.mycompany.model.TeamMemberDoc

    java.lang.RuntimeException: json can't serialize type : class com.mycompany.model.TeamMemberDoc

at com.mongodb.util.JSON.serialize(JSON.java:261)

at com.mongodb.util.JSON.serialize(JSON.java:141)

at com.mongodb.util.JSON.serialize(JSON.java:141)

at com.mongodb.util.JSON.serialize(JSON.java:58)

at com.mongodb.BasicDBObject.toString(BasicDBObject.java:84)

at com.foursquare.rogue.MongoHelpers$MongoBuilder$.buildModifyString(MongoHelpers.scala:124)

at com.foursquare.rogue.BaseModifyQuery.toString(Query.scala:800)

So basically the member document is handed down to the JSON serialization (from the MongoDB Java client) which of course has no clue what to do with it. 

I think Rogue should call '.asDBObject' before that, if it detects that the argument is a 'BsonRecord'.

What do you think?

[Marius Seritan]

I am also hitting a variation of this issue. I am trying to use setTo on an array deeper in the document structure and I get "json can't serialize type" where the type is the class of the array item. The class extends from a BsonRecord, has a meta set, the meta is the companion object and it inherits from BsonMetaRecord.

I am using some similar code in another part of the application and it is working there. I have not yet been able to figure out the difference between the two use cases.

[Marius Seritan]

My problem was fixed by eliminating one level of containment. The following structure does not seem to work

{ favorites : {version:1,items:[]}}

Flattening it up one level to the following is doing the trick

{favoritesVersion:1, favoritesItems:[]}

The data change is not optimal but it is something we can leave with.

Incidentally liftweb mongo record also added update(), sometimes in the last 6 months. That code also seems to work better with flat structures, when generating the $set/$unset database json it looks for dirty fields only at the top level.

Thanks for your contribution to the scala ecosystem with the Rogue library!

Marius