Taxonomy Hierarchy

Archive
1

Looking at a dump of the Grav variable taxonomy and reading through the source code, it appears that there is no concept of taxonomy hierarchy in Grav. That is if a blog is using categories and tags, there doesn’t seem to be a data structure that keeps track of which tags are used by which categories. So, if you want to create a menu with the categories as the first level and the tags used in each category in the second, there isn’t anything at hand to use.

Does that mean a plug-in would have to traverse the entire site to assemble such an array?

2

Yes taxonomies are simple independent arrays. If you want something more complex you can build it as a plugin.

3

Is there a built-in Grav mechanism to traverse the site’s pages and query the taxonomy assign to each? Or would that be custom, too?

4

There are events that are fired while Twig is traversing all the pages:

page-event-hooks

Take a look at the RelatedPages plugin. I think this is a good example of building up some other logic (related pages in this case) and caching those results (for performance) during the page processing within Grav.