Pacific Cycle
Search results
Mongoose provides a straight-forward, schema-based solution to model your application data. It includes built-in type casting, validation, query building, business logic hooks and more, out of the box.
With Mongoose, everything is derived from a Schema. Let's get a reference to it and define our kittens. const kittySchema = new mongoose. Schema ({ name: String}); So far so good. We've got a schema with one property, name, which will be a String. The next step is compiling our schema into a Model. const Kitten = mongoose. model ('Kitten ...
A mongoose query can be executed in one of two ways. First, if you pass in a callback function, Mongoose will execute the query asynchronously and pass the results to the callback . A query also has a .then() function, and thus can be used as a promise.
Mongoose also adds an _id property to subdocuments. You can disable the _id property on your subdocuments as follows. Mongoose does allow saving subdocuments without an _id property.
You can connect to MongoDB with the mongoose.connect() method. mongoose. connect ('mongodb://127.0.0.1:27017/myapp'); This is the minimum needed to connect the myapp database running locally on the default port (27017). For local MongoDB databases, we recommend using 127.0.0.1 instead of localhost.
Document and Model are distinct classes in Mongoose. The Model class is a subclass of the Document class. When you use the Model constructor, you create a new document. const MyModel = mongoose. model ('Test', new Schema ({ name: String})); const doc = new MyModel (); doc instanceof MyModel; // true doc instanceof mongoose. Model; // true doc ...
const db1 = mongoose. createConnection ('mongodb://127.0.0.1:27000/db1'); const db2 = mongoose. createConnection ('mongodb://127.0.0.1:27001/db2'); const conversationSchema = new Schema ({ numMessages: Number}); const Conversation = db2. model ('Conversation', conversationSchema); const eventSchema = new Schema ({ name: String, conversation ...
When you call mongoose.model() on a schema, Mongoose compiles a model for you. const schema = new mongoose. Schema ({ name : String , size : String }); const Tank = mongoose. model ( 'Tank' , schema);
Mongoose's index.d.ts file supports a wide variety of syntaxes and strives to be compatible with @types/mongoose where possible. This guide describes Mongoose's recommended approach to working with Mongoose in TypeScript.
Mongoose's Connection#transaction() function is a wrapper around withTransaction() that integrates Mongoose change tracking with transactions. For example, suppose you save() a document in a transaction that later fails.
