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Boosting Nodejs and MongoDB with Mongoose

Custom static and instance methods • Mongoose models introduces compared with Mongoskin and other lightweight MongoDB libraries The step creates a 

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Mongoose Models: - Instance Methods - Statics Methods associated with a Methods const userSchema = new Schema({ firstName: String, lastName: String ,

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Serving static files with express Document-oriented vs other types of storage d CRUD Operations in Mongodb a Creating custom instance methods e

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Adding instance method to mongoose create class and a method is not needed in node query is a collection your schema and static and the mongoose

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See also MongoDB basics of, 311 vs relational databases, 311 documents instance methods, defining (Mongoose), static methods, defining, 348–349

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16 jan 2019 · All IDOs implement the methods LoadCollection, UpdateCollection, for instance, that you store a Unit of Measure code in your base table string and compared with the value of the Credit Limit field that is returned 9 Optionally, use the Static Parameters tab to define name-value pairs that are used to 

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4 août 2013 · the data back into Model instances It shows how to use the built-in methods, and also how to extend Mongoose to run the specific queries that 

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1 nov 2020 · MERN stack, React, Redux, Node, Express, MongoDB, As depicted in Figure 3, functional components and class components can have the Mongoose's documentation page: instance methods, compound index, static 

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The three most common ways to define/create a function are to use a named expression, module C uses module B v2 0 (with breaking changes compared with v1 3), both A and C additional modules like static-favicon, morgan, cookie- parser and body-parser Database: an instance of MongoDB and some seed data

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Mongo Methods & References!1

-Instance Methods -Object References -Query Population!2

Mongoose Models: -Instance Methods -StaticsMethods associated with a SchemaMethods associated with an Object!3

Instance Methods!4

Methodsconst userSchema = new Schema({ firstName: String, lastName: String, email: String, password: String });userSchema.statics.findByEmail = function(email) { return this.findOne({ email : email}); }; userSchema.methods.comparePassword = function(candidatePassword) { const isMatch = this.password === candidatePassword; if (!isMatch) { throw new Boom('Password mismatch'); } return this; };Schema'Static' method: defined independently of any objectinstance method: associated with an object!5

Invoke static methodhandler: async function(request, h) { const { email, password } = request.payload; let user = await User.findByEmail(email); if (!user) { return h.redirect('/'); } user.comparePassword(password); request.cookieAuth.set({ id: user.id }); return h.redirect('/home'); }Invoke static method!6

Built in Static methods (mongoose)https://mongoosejs.com/docs/api.html#document-js!7

Object References!8

Donor References!9

donor: an object reference to a User objectDonor References: ObjectId!10

User Reference instanceUserUser Reference!11

Query Population!12

Query PopulationPopulation is the process of automatically replacing the specified paths in the document with document(s) from other collection(s). We may populate a single document, multiple documents, plain object, multiple plain objects, or all objects returned from a query.https://mongoosejs.com/docs/populate.htm!13

report: { handler: async function(request, h) { const donations = await Donation.find(); return h.view('report', { title: 'Donations to Date', donations: donations }); } },!14

-Default query returns donations with donor containing ObjectID only!15

Default Queryreport: { handler: async function(request, h) { const donations = await Donation.find(); return h.view('report', { title: 'Donations to Date', donations: donations }); } },report: { handler: async function(request, h) { const donations = await Donation.find().populate('donor'); return h.view('report', { title: 'Donations to Date', donations: donations }); } },Populate Donor!16

-Donor has complete contents of user objectDonation.find().populate('donor'); !17

-Subdocument directly available in template {{#each donations}} {{amount}} {{method}} {{donor.firstName}} {{donor.lastName}} {{/each}} !18

'use strict'; const Boom = require('boom'); const Mongoose = require('mongoose'); const Schema = Mongoose.Schema; const userSchema = new Schema({ firstName: String, lastName: String, email: String, password: String }); userSchema.statics.findByEmail = function(email) { return this.findOne({ email : email}); }; userSchema.methods.comparePassword = function(candidatePassword) { const isMatch = this.password === candidatePassword; if (!isMatch) { throw new Boom('Password mismatch'); } return this; }; module.exports = Mongoose.model('User', userSchema); 'use strict'; const Mongoose = require('mongoose'); const Schema = Mongoose.Schema; const donationSchema = new Schema({ amount: Number, method: String, donor: { type: Schema.Types.ObjectId, ref: 'User' } }); module.exports = Mongoose.model('Donation', donationSchema);'use strict'; require('dotenv').config(); const Mongoose = require('mongoose'); Mongoose.connect(process.env.db); const db = Mongoose.connection; db.on('error', function(err) { console.log(`database connection error: ${err}`); }); db.on('disconnected', function() { console.log('database disconnected'); }); db.once('open', function() { console.log(`database connected to ${this.name} on ${this.host}`); })Donation Models!19

Donation Controllerconst Donations = { home: { handler: function(request, h) { return h.view('home', { title: 'Make a Donation' }); } }, report: { handler: async function(request, h) { const donations = await Donation.find().populate('donor'); return h.view('report', { title: 'Donations to Date', donations: donations }); } }, donate: { handler: async function(request, h) { const id = request.auth.credentials.id; const user = await User.findById(id); const data = request.payload; const newDonation = new Donation({ amount: data.amount, method: data.method, donor: user._id }); await newDonation.save(); return h.redirect('/report'); } } };!20

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