Mongoose

Models

Models are fancy constructors compiled from our Schema definitions. Instances of these models represent documents which can be saved and retreived from our database. All document creation and retreival from the database is handled by these models.

Compiling your first model

var schema = new Schema({ name: 'string', size: 'string' });
var Tank = mongoose.model('Tank', schema);

// or, if you are using separate connections
var db = mongoose.createConnection(..);
var Tank = db.model('Tank', schema);

Constructing documents

Documents are instances of our model. Creating them and saving to the database is easy:

var Tank = db.model('Tank', yourSchema);

var small = new Tank({ size: 'small' });
small.save(function (err) {
  if (err) return handleError(err);
  // saved!
})

// or

Tank.create({ size: 'small' }, function (err) {
  if (err) return handleError(err);
  // saved!
})

Querying

Finding documents is easy with Mongoose, which supports the rich query syntax of MongoDB. Documents can be retreived using each models find, findById, findOne, or where static methods.

Tank.find({ type: 'small' }).where('createdDate').gt(oneYearAgo).exec(callback);

See the chapter on querying for more details on how to use the Query api.

Removing

Models have a static remove method available for removing all documents matching conditions.

Tank.remove({ size: 'large' }, function (err) {
  if (err) return handleError(err);
  // removed!
});

Updating

Each model has its own update method for modifying documents in the database without returning them to your application. See the API docs for more detail.

Yet more

The API docs cover many additional methods available like count, mapReduce, and more.