Hi, on mongo console, this brings me a persons information from mongo db db.Persons.find({"_id" : ObjectId("75b900000000000000000000")}) I try to query the same person from pharo and I do not succeed. This makes my image hanging: RKAPerson selectMany: {('_id' -> (OID value:'75b900000000000000000000'))} also other variations e.g. RKAPerson selectMany: {('_id' -> ('75b900000000000000000000')). } asDictionary. do not work Other queries like RKAPerson selectMany:{('lastName' -> ('Maier')).} asDictionary. or RKAPerson selectMany:{('nextTripNumber' -> (57)).} asDictionary. work fine. How can I query for an object with the object id? Regards Sabine -- View this message in context: http://forum.world.st/Mongo-find-object-by-id-tp4842231.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.