It seems mongo does not allow insertion of keys with a dot (.) or dollar sign ($) however when I imported a JSON file that contained a dot in it using the mongoimport tool it worked fine. The driver is complaining about trying to insert that elemen...
I use Mongoose.js and cannot solve problem with 3 level hierarchy document.  There 2 ways to do it.  First - without refs.  C = new Schema({     'title': String, });  B = new Schema({     'title': String,     'c': [C] });  A =...
how do i add a value to the top of an array in mongodb?  say i have this document in my mongo collection:  { "colors" : [ "red", "green", "blue" ] }   how do i add "yellow" to the front of the list?  when i do:...
I want to reuse MongoDB connection. I 'am aware of How to reuse mongodb connection in node.js  I want to acheive the same using Promises and Mongo driver v2  Currently I have to connect to db for every request which makes it slow. This is my code...
I’m creating a NoSQL database using Firebase, but as I’m a SQL thinker my mind needs some advices about Firebase queries and NoSQL Data Structure.  I am making some experiments for a Mobile App using also Ionic 2 (AngularJS 2), and my concerns ar...
I have used mongodb database and node.js v12.0.10 for connecting and updating mongodb collection. connection code is the following:   async.parallel({         RE5: function (cb) {             MongoClient.connect(config.riskEngineDB, function (err, r5...
I have a Firebase database structuring question. My scenario is close to a chat application. Here are the specifics  - users(node storing several users of the app)   - id1       name: John   - id2       name: Meg   - id2       name: Kelly - messages(...
Where I work it is pretty restricted in terms of IT. I do not have access to an SQL Server or a Web server so things like Apache, PHP, mySQL etc are all off the table. No server side anything. The PCs on the network cannot see each other (so installi...
While exploring mongoose for nodejs I ran into the problem of needing to know the amount of user in my collection:   My collection has records, each record has a user. I want to know the amount of unique (different) users.  How can I do this with mon...
Imagine following mongoose model:  const UserSchema = Schema({   //_id: ObjectId,   //more fields,   blockedIds: [{     type: ObjectId,     ref: 'User'   }] })   What is the most efficient way to get all users that don't match the blocked...

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