Mongodb dot notation wildcard?

Question

I have a collection of users, each of which may be subscribed to one or more services. Each service has some meta data, including the number of credits the user has for that

Answer 1

I think it would be easier if you put that services object into an array, so you can use $elemMatch, like:

{
  services : [
    {key: "a" , credits : 100, score : 2000 },
    {key: "b", credits : 200, score : 300 },
    {key: "c", credits : 10, score : 1300 }
  ]
}

and

{
  _id: 4f0ea25072139e4d2000001f,
  services : [
    {key: "f", credits : 68, score : 14 },
    {key: "q", credits : 1000, score : 102 },
    {key: "z", credits : 59, score : 352 }
  ]
}

Then the query you would write would be like this:

db.coll.find({services: {$elemMatch : {credits: {$lt: 50}}}});

result:

{ "_id" : ObjectId("4f0f2be07561bf94ea47eec4"), "services" : [  {   "key" : "a", "credits" : 100, "score" : 2000 }, { "key" : "b", "credits" : 200, "score" : 300 },    {   "key" : "c",    "credits" : 10,     "score" : 1300 } ] }