expressSimpleBlog
Simple Blog example with Express, Jade, Mongoose
This example covers following topics;
expressmongoosejadesessionschema decorationsecurityroutesideal project structure
Quick links ;
Basic express installation
npm install -g express
express
create : .
create : ./package.json
create : ./app.js
create : ./public
create : ./public/javascripts
create : ./public/images
create : ./public/stylesheets
create : ./public/stylesheets/style.css
create : ./routes
create : ./routes/index.js
create : ./routes/user.js
create : ./views
create : ./views/layout.jade
create : ./views/index.jade
install dependencies:
$ cd . && npm install
run the app:
$ node appSchema examples
###Single
User = new Schema({
name:{
type:String,
required:false,
default: ""
},
username:{
type:String,
validate:[validator({
length:{
min:3,
max:20
}
}), "username"],
required:false,
default: "defaultusername"
},
password:{
type:String,
required:true
},
email:{
type:String,
required:true
},
registerDate:{
type:Date,
required:true,
default: Date.now
},
loginDate:{
type:Date,
required:false
}
});###Embedded
Comment = new Schema({
text:{
type:String,
required:true
},
author:{
type:String,
validate:[validator({
length:{
min:3,
max:20
}
}), "username"],
required:false,
default:"anonymous"
},
createDate:{
type:String,
required:false,
default: Date.now
}
});
Blog = new Schema({
title:{
type:String,
required:true
},
text:{
type:String,
required:true
},
author:{
type:String,
validate:[validator({
length:{
min:3,
max:20
}
}), "username"],
required:false,
default:"anonymous"
},
comments: {type: [Comment]},
createDate:{
type:Date,
required:false,
default: Date.now
}
});##Mongoose best practises ###1 Find specific user by username
Model.findOne({username: "johndoe"}, function(err, userName) {
if (err) {
next("technical error occured");
} else {
if (userInfo) {
next("User details : " + userInfo);
} else {
next("User not found")
}
}
});###2 Find users have age under 18 and sort them desc
var query = Model.find({age: {$lt: 18}}).sort({age: -1});
query.execFind({}, function(err, users) {
if (err) {
next("Technical error occured");
} else {
if (users) {
next("How could you registered to my system? You will be banned one by one!!!");
users.forEach(function(user) {
user.status = "banned";
user.save(function(err) {
if (err) {
next("Technical error occured while banning user : " + user);
} else {
next("Go find another buggy system to yourself!!!");
}
});
})
} else {
next("System has no security vulnerability:)")
}
}
});###3 Insert subdocument
Model.findOne({username: "johndoe"}, function(err, userInfo) {
if (err) {
next("Technical error occured");
} else {
if (userInfo) {
var SubModel = new SubModel();// Assumed to be initialized somewhere above in the sky
SubModel.projectName = "SocialAuth";
SubModel.projectLanguage = "PHP";
SubModel.projectCost = 100;
userInfo.projects.push(SubModel);
userInfo.save(function(err) {
if (err) {
next("Technical error again.What a stable system i am");
} else {
next("New project experience added to user : " + userInfo.username);
}
});
}
}
});###4 Update subdocument
Model.update(
{
username: "johndoe", project.name: "SocialAuth"
},
{
$inc: {'projects.$.cost': 200}
},
//In order to update all documents. If you set this false, it will update only first found document
{multi: true},
function(err, result) {
if (err) {
next("Technical error occured");
} else {
next("Project finished its first year so i am updating its price as 200$ :)");
}
}MongoDB credentials setup for project
In this project some user authentication methods have been used, so you can seup your mongodb user for your db;
mongo localhost
use <blog>
db.addUser("test", "123456")Added user test for b blog. This will be used in project config
Nested functions to waterfall
In express applications, there is a view problem on nested functions. Let's eee it in an example;
Model1.findOne({username: "johndoe"}, function(err, userInfo) {
if (err) {
........
} else {
Model2.find({age: userInfo.age}, function(err, model2Info) {
if(err) {
......
} else {
Model3.find({something: model2Info.count}, function(err, model3Info) {
if (err) {
........
} else {
.................
............
..............
//4 more nested function
Model8.find({}, function(err, someInfo) {
if(err) ............
else
next("I have found the result but i don't want to use this result because of this nasty nested function!!!");
});
}
});
}
});
}
});In real projects, there are such cases, so our hero on this case is;
I prefer async, because i used them and async wins :) async also has 3466 stars but step has 1091. There are several ways to re-implement above nested function by using async. We can use waterfall model(For more info please refer to project github documentation)
async.waterfall([
function(callback) {
Model1.findOne({username: "johndoe"}, function(err, userInfo) {
callback(null, userInfo);
});
},
function(userInfo, callback) {
Model2.find({age: userInfo.age}, function(err, model2Info) {
callback(null, model2Info);
});
},
function(model2Info, callback) {
Model3.find({something: model2Info.count}, function(err, model3Info) {
var dummy = 15;
callback(null, model3Info, dummy);
});
},
function(modelInfo, count, callback) {
var some = foo(modelInfo, count);
callback(null, some);
},
..........................
......................
,
function(modelInfo, callback) {
callback(null, modelInfo);
}
], function(err, result) {
if (err) .......
else
next("Result found and i am happy to use this result");
});