October 2017
Intermediate to advanced
566 pages
14h 31m
English
Content preview from Drupal 8 Module Development
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Base fields
Base fields are the fields most close to a given entity type, things like the title, creation/modification date, publication status, and so on. They are defined in the entity type class as BaseFieldDefinition implementations and are installed in the database based on these definitions. Once installed, they are no longer configurable from a storage point of view from the UI (except in some cases, in which certain aspects can be overridden). Additionally, some display and form widget configuration changes can still be made (also depending on whether the individual definitions allow this).
Let's check out the Node entity type's baseFieldDefinitions() method and see an example of a base field definition:
$fields['title'] = BaseFieldDefinition::create('string') ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.