Ambicular

'Ambicular' is an experimental One Pager that takes you deep into the sounds of a forest. The levels are adjustable too, just tweak the settings and let the calming sounds play in the background while you relax.

by Rob Hope via One Page Love

Triple M

Site Description: The goal of the website to present a Out of the Box design. Based on WordPress CMS and designed \’in house\’ by Fatmama.be. The website is about logistics services in the entertainment industry, operating all over de the globe.

by csreladm via CSSREEL | CSS Website Awards | World best websites | website design awards | CSS Gallery

Code web Barcelona

Code is a web design agency based in Barcelona.

by csreladm via CSSREEL | CSS Website Awards | World best websites | website design awards | CSS Gallery

Web Development Company in Pune

Dwij IT Solutions is distinct Web Design, Web Development and Mobile Application Development Company in Pune. We build superior Websites completing all needs for a Agency, Business, Startup, E-Commerce & Bloggers.

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Beavis – HTML5 Coming Soon Template

Beavis is a Versatile, Multi-concept, High-Performance Coming Soon Template made using well-structured CSS, SASS & Angular JS. It comes with 14 Young and Beautiful Demos with unmatched performance across all modern devices. Beavis is a perfect choice

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BKO Incorporadora

FUNDADA EM 1986, A BKO INCORPORADORA E CONSTRUTORA ATUA NO MERCADO IMOBILIÁRIO DESENVOLVENDO EDIFÍCIOS COMERCIAIS E RESIDENCIAIS DE MÉDIO E ALTO PADRÃO

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Drupal 8 Entity Validation and Typed Data Explained

Data validation is a very important part of any application. Drupal 7 has a great Form API that can handle complex validation of submitted data, which can then be turned into entities. However, form level validation is problematic. For example, it becomes difficult to handle entity (data) validation programmatically. We have to either reimplement validation logic or mimic form submissions in code. This makes any data interaction dependent on the form system and this is a bad idea.

With the introduction of subsystems such as the REST API, Drupal 8 needed something better to handle this problem. The Symfony Validation component was chosen and Drupal 8 builds on top of it to tailor for the realties of the Typed Data and plugin based Entity system. So now, form submissions validate entities just like REST calls do or any other programmatic interaction with the entities easily can.

In this article, and its followup, we will explore the Drupal 8 Entity Validation API, see how it works, and how it can be extended. To better understand this, we will also take a look at the Typed Data API which underpins the entity system in Drupal 8. There will be some code examples that already exist in core but we will also write a bit of our own code which can be found in this git repository within the demo module.

Typed Data

Typed Data is the Drupal 8 API that was built to provide a consistent way of interacting with data or metadata about the data itself. Why is this important for our topic? Because validation is defined and invoked on typed data objects.

Two important components of this API stand out: the data definition and the DataType plugins. The role of the former is to define data and how interaction works with it (including things like settings or validation constraints). The role of the latter is to provide a way to get and set values from that type of data. When they are instantiated, data type plugins make use of data definition instances passed on by the plugin manager. The latter can also infer which data definition needs to be used by a DataType plugin type.

Let’s see an example:

$definition = DataDefinition::create('string')
    ->addConstraint('Length', array('max' => 20));

We created a string data definition and applied the Length constraint to it. Constraints are a key part of the validation API and they define the type of validation that will run on the data. They are coupled with a validator that actually performs the task, but we will see more about constraints and validators in the second part of this series.

Continue reading %Drupal 8 Entity Validation and Typed Data Explained%

by Daniel Sipos via SitePoint