Question

I am trying to update the following document in Mongodb.

    doc = { id : 10 , graph :[{userId:1,children:[2]},{userId:2,children:[]}]}

    db.test.insert(doc)

then I perform two updates:

db.test.update( {'id':10,'graph.userId' : 1}, { $push:{'graph.$.children':10}})

db.test.update( {'id':10,'graph.userId' : 1},{ $push:{'graph':{'userId':10,'children':[]}}})

(Saddly :

db.test.update( {'id':10,'graph.userId' : 1},{ $push:{'graph.$.children':10},$push:{'graph':{'userId':10,'children':[]}}})

does not work)

Is there a way to update these simultaneously ?

Thanks a lot

Answer 1

The multiple keys in the modifier array stop it from working. You have to do two updates to do this if I read your shema right cos you are trying to push a new child onto the current position and push a new record into the subdocument of the parent.

The thing that stops it is the children[] setting. Mongo just does not know where to set that.

I suppose you could try:

db.test.update( {'id':10,'graph.userId' : 1},{ $push:{'graph.$.children':10},$pushAll:{'graph':{{'userId':10,'children':[]}}}})

But it is a long shot