NodeJS Mongoose Models

Posted by On 2月 28, 2015 0 Comment

Schema : NodeJS Mongoose Schema

Models

All operations are done by Models
Model is created by schema

mongoose.connect('localhost', 'mydb');
var schema = new mongoose.Schema({ name: 'string', size: 'string' });
var Task = mongoose.model('Task', schema);

// Documents are instances of model

// Save
var s = new Task({size: 'small'});
s.save(function(err) {
  if (err) {
     return;
  }
  // saved
});

You can also use create method. it’s same as save

Remove

Task.remove({size: 'midium'}, function(err) {
  if (err) return;
});

Query

select

We can use select column like database

var query = Person.findOne({ 'name.last' : 'Ghost'});
query.select('name occupation');  // SELECT
query.exec(function(err, person) {    // use exec
  // person
});

Example query(interesting full)

Person
 .find({ occupation: /host/ })  // Regular Expression
 .where('name.last').equals('Ghost')
 .where('age').gt(10).lt(50)
 .where('likes').in(['a', 'b'])
 .limit(10)
 .sort('-occupation')			//  .sort({occupation: -1})
 .select('name occupation')
 .exec(function(err, results) {
 });

Documents

document is an instance of Model

Sub Doc

Sub-documents are docs with schemas of their own which are elements of a parents document array
Details are Guide

var childSchema = new Schema({ name: 'string' });
var parentSchema = new Schema({
  children: [childSchema]
});

var Parent = mongoose.model('Parent', parentSchema);
var parent = new Parent({ children: [{ name: 'Lightning' }, { name: 'Sera' }] });
parent.children[0].name = 'Hope';
parent.save(function(err) {
});

Finding a sub-document

var doc = parent.children.id(id);   // _id

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