Mittwoch, 18. Mai, 2016

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MongoDB CRUD the MVC way with Passport Authentication 52 Mongoose Mongoose¹⁰⁶ is a Node.js ODM (object document mapper) module that translates your objects in code to the document representation of the data in MongoDB. You may be familiar with ORM, and you can see the difference explained here¹⁰⁷. While MongoDB doesn’t enforce a schema, Mongoose offers a stricter schema approach. Continue with the application The following examples continue where we left off in the second tutorial¹⁰⁸. So, feel free to clone the second project from GitHub¹⁰⁹ and follow along. Connect to MongoDB First, you need to install Mongoose by issuing the following command (once you’re in the project root folder - and, just so I won’t have to stress this every time; from now on every npm install command should be done from the project’s root folder (where’s your server.js file)): 1 npm install mongoose --save To connect to MongoDB, you need to use the MongoDB connection URI, which looks like this: 1 mongodb://username:password@hostname:port/database But, since you’re connecting on a localhost (your own computer), you can skip the username and password part and use: 1 mongodb://localhost/todos The simplest thing you could do is define this connection URI variable directly in your config/__- express.js configuration file and use the Mongoose module to connect to the database: 1 var uri = 'mongodb://localhost/todos'; 2 var db = require('mongoose').connect(uri); but this is bad practice. The proper way to store application variables is to use your environment configuration file. In the config folder create an env folder and inside it create a development.js file with the following code: ¹⁰⁶http://mongoosejs.com/ ¹⁰⁷http://stackoverflow.com/questions/12261866/what-is-the-difference-between-an-orm-and-an-odm ¹⁰⁸https://hackhands.com/delving-node-js-express-web-framework/ ¹⁰⁹https://github.com/Hitman666/MEAN_MVC_2ndTutorial
MongoDB CRUD the MVC way with Passport Authentication 53 1 var port = 1337; 2 3 module.exports = { 4 port: port, 5 db: 'mongodb://localhost/todos' 6 }; Now, in your config folder, create a new file named mongoose.js with the following code: 1 var config = require('./config'), 2 mongoose = require('mongoose'); 3 4 module.exports = function() { 5 var db = mongoose.connect(config.db); 6 return db; 7 }; Environment configuration file Hopeful reader as you are, you may have noticed that you’re requiring the ./config file which you do not yet have. To fix this, create a config.js file in the config folder and place the following code inside: 1 module.exports = require('./env/' + process.env.NODE_ENV + '.js'); This will let you load the correct db (and other variables that we’ll define later) variable based on your environment (be it a development or production) configuration file. The process.env is a global variable that allows you to access predefined environment variables, and the most common one is NODE_ENV. To set it in a Windows environment execute the following command in your command prompt: 1 set NODE_ENV=development and in an Unix-based environment execute: 1 export NODE_ENV=development Now, update the server.js file to the following content (most of the code you already have, you’re just adding the Mongoose specific code, along with environment variable setting):
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Mittwoch, 18. Mai, 2016

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