tornado-motor

I've this query: produits = yield motor.Op(db.users.aggregate, [{"$unwind":"$pup"},{"$match":{"pup.spec.np":nomp}}, {"$group":{"_id":"$pup.spec.id","pup":{"$push":"$pup"}}}]) which gives me this result: print produits {u'ok': 1.0, u'result': [{u'_id': None, u'pup': [{u'avt': {u'fto': ..all the results}}]}]} so I can do: prod = produits["result"] [{u'_id': None, u'pup': [{u'avt': {u'fto': ..all the results}}]}] but how can I hide "_id" so that I can only get: [{u'pup': [{u'avt': {u'fto': ..all the results}}]}] in a normal query I would simply add something like {"_id":0} but here it doesn't

I'm new to the concept of non-blocking IO, and there is something i'm having trouble understanding - about coroutines. consider this code: class UserPostHandler(RequestHandler): @gen.coroutine def get(self): var = 'some variable' data = json.loads(self.request.body) yield motor_db.users.insert({self.request.remote_ip: data})#asynch non blocking db insert call #success self.set_status(201) print var when the get function is called, it creates the string var . what happens to this variable when the function waits for the motor.insert to complete? To my understanding "non blocking" implies that

I want to return true if a userID already exists and false otherwise from my collection.I have this function but it always returns True . def alreadyExists(newID): if db.mycollection.find({'UserIDS': { "$in": newID}}): return True else: return False How could I get this function to only return true if a user id already exists? Philipp Note: This answer is outdated. More recent versions of MongoDB can use the far more efficient method db.collection.countDocuments . See the answer by Xavier Guihot for a better solution. find doesn't return a boolean value, it returns a cursor . To check if that