Tutorial by Examples: in

Defining Models

There are two ways to define models in sequelize; with sequelize.define(...), or sequelize.import(...). Both functions return a sequelize model object. 1. sequelize.define(modelName, attributes, [options]) This is the way to go if you'd like to define all your models in one file, or if you want to...

Node.js • Sequelize.js

How to work with JavaScript plugins

There are four ways to work with JavaScript plugins, Ember add-on Import JavaScript plugins globally Consume named AMD plugins Via ember-browserify

ember.js • Getting started with ember.js

Writing simple value into database

First, complete the installation and setup to connect your app to Firebase. Then from anywhere in your class, you can write: // Write a message to the database FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message"); myRe...

firebase-database • Getting started with firebase-database

Lists in lists in lists in...

This behaviour can be extended. Here is a 3-dimensional array: [[[111,112,113],[121,122,123],[131,132,133]],[[211,212,213],[221,222,223],[231,232,233]],[[311,312,313],[321,322,323],[331,332,333]]] As is probably obvious, this gets a bit hard to read. Use backslashes to break up the different dim...

Python Language • Multidimensional arrays

Adding a third party plugin to build.gradle

Gradle (All Versions) This method works for all versions of gradle Add the buildscript code at the beginning of your build.gradle file. buildscript { repositories { maven { url "https://plugins.gradle.org/m2/" } } dependencies { classpath "org.example...

gradle • Using third party plugins

build.gradle with multiple third party plugins

Gradle (All Versions) When adding multiple third party plugins you do not need to separate them into different instances of the buildscript(All) or plugin(2.1+) code, new plug ins can be added alongside pre-existing plugins. buildscript { repositories { maven { url "https://plu...

gradle • Using third party plugins

One or two parameters in callback—error handling in d3.request()

When using d3.request() or one of the convenience constructors (d3.json, d3.csv, d3.tsv, d3.html and d3.xml) there are many sources for error. There may be problems with the issued request or its response due to network errors, or the parsing might fail if the content is not well-formed. Within the...

d3.js • Using D3 with JSON and CSV

Action caching

Like page caching, action caching caches the whole page. The difference is that the request hits the Rails stack so before filters are run before the cache is served. It's extracted from Rails to actionpack-action_caching gem. A common example is caching of an action that requires authentication: ...

Ruby on Rails • Caching

Splitting Strings using CROSS APPLY (Oracle 12c)

Sample Data: CREATE TABLE table_name ( id, list ) AS SELECT 1, 'a,b,c,d' FROM DUAL UNION ALL -- Multiple items in the list SELECT 2, 'e' FROM DUAL UNION ALL -- Single item in the list SELECT 3, NULL FROM DUAL UNION ALL -- NULL list SELECT 4, 'f,,g' FROM DUAL; -- NULL item...

Oracle Database • Splitting Delimited Strings

Encryption and Decryption using Cryptography (AES)

Decryption Code public static string Decrypt(string cipherText) { if (cipherText == null) return null; byte[] cipherBytes = Convert.FromBase64String(cipherText); using (Aes encryptor = Aes.Create()) { Rfc2898DeriveBytes pdb = ...

.NET Framework • Encryption / Cryptography

Getting details of Linux kernel.

We can use command uname with various options to get complete details of running kernel. uname -a Linux df1-ws-5084 4.4.0-64-generic #85-Ubuntu SMP Mon Feb 20 11:50:30 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux As per man page here few more options Usage: uname [OPTION]... Print certain system inf...

GNU/Linux • Getting information on a running Linux kernel

Replacing fragments with ajax

If you want to replace parts of your website, ajax is an easy way to do it. The website.html where you want to replace the content based on the selected value: <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"> ...

thymeleaf • Getting started with thymeleaf

Access to Request in a Twig or PHP template.

In Twig template, Request object is available at {{ app.request }} When you want display request method in Twig, try this: <p>Request method: {{ app.request.method }}</p> In PHP template <p>Request method: <?php echo $app->getRequest()->getMethod() ?></p>...

symfony2 • Request

Grouping a few input fields

While designing a form, you might like to group a few input fields into a group to help organise the form layout. This can be done by using the tag . Here is an example for using it. For each fieldset, you can set a legend for the set using the tag LEGEND TEXT Example <form> <fieldset...

HTML • Forms

Basic jumbotron with two lines of text and a button

This is a jumbotron with a title, a content and a button. Code <div class="jumbotron"> <h1>Title text</h1> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec tortor ipsum, convallis sit.</p> <p><a class="btn btn-default&...

twitter-bootstrap • Jumbotron

Observer using IObservable and IObserver (C#)

IObserver<T> and IObservable<T> interfaces can be used to implement observer pattern in .NET IObservable<T> interface represents the class that sends notifications IObserver<T> interface represents the class that receives them public class Stock { private string Sym...

Design patterns • Observer

Adding the "Theme page title" item to the nav bar

Code function add_the_theme_page(){ add_menu_page('Theme page title', 'Theme menu label', 'manage_options', 'theme-options', 'page_content', 'dashicons-book-alt'); } add_action('admin_menu', 'add_the_theme_page'); function page_content(){ echo '<div class="wrap"><h2&...

WordPress • add_menu_page()

Secure your WebApp with Login and Logout

This example is a very simple Spring Boot application. Maven Dependencies At first add the following dependencies to your project. Spring Initializr is recommended when you create a new project. <parent> <groupId>org.springframework.boot</groupId> <artifactId>spr...

thymeleaf • Spring Security and Thymeleaf

Adding the "Submenu Page" as a sub-page of "Tools" to the nav bar

Code add_action('admin_menu', 'register_my_custom_submenu_page'); function register_my_custom_submenu_page() { add_submenu_page( 'tools.php', 'Submenu Page', 'My Custom Submenu Page', 'manage_options', 'my-custom-submenu-page', 'my_cust...

WordPress • add_submenu_page()

Handling non-existing options

Code <?php echo get_option( 'something_bla_bla_bla' ); ?> Output false Code <?php echo get_option( 'something_bla_bla_bla', 'Oh no!' ); ?> Output Oh no!

WordPress • get_option()