Remove JSON objects which have specific field type from JSON array field in MongoDB document -

given collection documents have array field containing json objects (key-value pairs) e.g.:

{ ..., arr : [{key: val}, {key : numberlong(100)}]} 

after update, same document should like:

{ ..., arr : [{key: val}]} 

the document in arr field:

{key : numberlong(100)}

should removed.

is possible mongodb $ operators? tried use following code no avail:

 db.coll.find({}).foreach( function(doc) {      var objs = doc.arr;      for(var = objs.length; i--;){          if (typeof(objs[i].ts) == numberlong)              objs.splice(i,1);      }      db.coll.save(doc); }) 

i suppose looking remove data array this:

{      "field" : "aaa",      "list" : [  "aaa",  numberlong(123),  "bbb",  numberlong(456) ]  } 

you can using $pull takes query expression it's argument

 db.collection.update({ },{ "$pull": { "list": {"$type": 18 } } }) 

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edit

since question has changed, still doesn't change in answer though:

{      "list" : [         { "key" : "val" },          { "key" : numberlong(100) },         { "key" : numberlong(123) }      ]  } 

and same query:

 db.list.update({ }, { "$pull": { "list": { "key": {"$type": 18  } } } }) 

then numberlong() types removed.

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add { "multi": true } want happen on multiple documents.

so uses $type in order match "numberlong" elements, 64-bit integers. values each "type" on manual page.

the positional $ operator not suit here as:

1. it not valid argument can used remove elements.

2. even used $set , "setting" value false, match first element matched in array. @ rate not removing item , still need use pull.

also, javascript method, typeof() looking not return other object javascript implementation. have test in way.

but don't. using native update methods best way.