October 2017
Intermediate to advanced
566 pages
14h 31m
English
Content preview from Drupal 8 Module Development
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Menu link tree manipulators
When loading a menu link tree, you get the entire tree that fits the specified parameters. However, when using that tree, you probably want to perform some checks and remove certain items. A common example is to remove the menu links to which the user doesn't have access. This is where manipulators come into place.
The MenuLinkTree service has a transform() method, which alters a tree based on an array of manipulators. The latter take the form of callables, typically service names with specific methods. So, the actual manipulators are services that traverse the tree and make alterations to the tree items, their order, and so on.
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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.