NodeJS Mongoose Schema

MongoDB + Mongoose

About Mongoose : Guide
This post is based on Official Guide of Mongoose

• Definition Schema
• Schema Type
• Schema instance methods
• Static
• Index
• Schema options
• Auto Increment

Definition Schema

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var blog = new Schema({
   title: String,      // key: type  general text
   author: String,
   body: String,
   comments: [{ body: String, date: Date }],        // Array
   date: { type: Date, default: Date.now },		    // type and default 
   hidden: Boolean,
   meta: {
      votes: Number,
	  favs: Number       // hash?
   }
});

required : Same as database not null

var s = new Schema({ name: { type: String, required: true });

Schema Type

Support Type : Official Guide

• String
• Number
• Date
• Buffer
• Boolean
• Mixed
• ObjectId
• Array

Schema instance methods

We can add instance method against Schema. It’s javascript feature.

var modelSchema = new Schema({name: String, type: String });

modelSchema.methods.findByType = function(typeattr) {
  return this.model('Model').find({ type: this.type }), typeattr);
}

var iModel = mongoose.model('Model', modelSchema); // All operations in model
var a = new iModel({ type: 'aclass' });

a.findByType(function (err, models) {   // Use in model
  console.log(models);
});

Static

Adding static methods to a Model is simple as well

Adding static methods to a Model is simple as well

var modelSchema = new Schema({name: String, type: String });
modelSchema.statics.findByName = function(name, attr) {
   // this.find({ name: new RegExp(name, 'xx') }, attr);
}

Index

Use index option

var test = new Schema({
  name: String,
  type: String,
  tags : { type: [String], index: true}    // Array + index  ??
});

// You can also add index method
test.index({ name: 1, type: -1});    // name is true

Schema options

• autoIndex
• capped
• collection
• id
• _id
• read
• safe
• shardKey

Auto Increment

To realize this, we need plugin
mongoose-auto-increment