I assume you already know that MongoDB is a NoSQL database system which stores data in the form of BSON documents. Your question, however is about the packages for Node.js. In terms of Node.js, mongodb is the native driver for interacting with a mongodb instance and mongoose is an Object modeling tool for MongoDB. mongoose … Read more
UPDATE: (5 years later) Note: If you decide to use Kappa Architecture (Event Sourcing + CQRS), then you do not need updated date at all. Since your data is an immutable, append-only event log, you only ever need event created date. Similar to the Lambda Architecture, described below. Then your application state is a projection … Read more
Mongoose Models inherit from Documents, which have a toObject() method. I believe what you’re looking for should be the result of doc.toObject(). http://mongoosejs.com/docs/api.html#document_Document-toObject
Check your mongo version: mongo –version If you are using version >= 3.1.0, change your mongo connection file to -> MongoClient.connect(“mongodb://localhost:27017/YourDB”, { useNewUrlParser: true }) or your mongoose connection file to -> mongoose.connect(“mongodb://localhost:27017/YourDB”, { useNewUrlParser: true }); Ideally, it’s a version 4 feature, but v3.1.0 and above are supporting it too. Check out MongoDB GitHub … Read more
Mongoose uses the mongodb-native driver, which uses the custom ObjectID type. You can compare ObjectIDs with the .equals() method. With your example, results.userId.equals(AnotherMongoDocument._id). The ObjectID type also has a toString() method, if you wish to store a stringified version of the ObjectID in JSON format, or a cookie. If you use ObjectID = require(“mongodb”).ObjectID (requires … Read more
Assuming, var friend = { firstName: ‘Harry’, lastName: ‘Potter’ }; There are two options you have: Update the model in-memory, and save (plain javascript array.push): person.friends.push(friend); person.save(done); or PersonModel.update( { _id: person._id }, { $push: { friends: friend } }, done ); I always try and go for the first option when possible, because it’ll … Read more
It’s simple, you can define this in the subschema : var mongoose = require(“mongoose”); var subSchema = mongoose.Schema({ // your subschema content }, { _id : false }); var schema = mongoose.Schema({ // schema content subSchemaCollection : [subSchema] }); var model = mongoose.model(‘tablename’, schema);
I’m am very disappointed by the accepted answers in this question. This will not scale. If you read the fine print on cursor.skip( ): The cursor.skip() method is often expensive because it requires the server to walk from the beginning of the collection or index to get the offset or skip position before beginning to … Read more
The error message is saying that there’s already a record with null as the email. In other words, you already have a user without an email address. The relevant documentation for this: If a document does not have a value for the indexed field in a unique index, the index will store a null value … Read more
The find function in mongoose is a full query to mongoDB. This means you can use the handy mongoDB $in clause, which works just like the SQL version of the same. model.find({ ‘_id’: { $in: [ mongoose.Types.ObjectId(‘4ed3ede8844f0f351100000c’), mongoose.Types.ObjectId(‘4ed3f117a844e0471100000d’), mongoose.Types.ObjectId(‘4ed3f18132f50c491100000e’) ]} }, function(err, docs){ console.log(docs); }); This method will work well even for arrays containing tens … Read more