I'm trying to define a View listing content nodes which are tagged with a hierarchical taxonomy. The nodes are collected using contextual filter "Content: Has taxonomy term ID (with depth)" and this I got working. However I still need to group the nodes using a criterion/field that's not easily available. I'd call it "Second-level term", that is to say that in the following example:
Top Term 1
Term 1.1
Term 1.2
Term 1.2.1
Term 1.2.1.1
Top Term 2
Term 2.1
Term 2.1.1
Term 2.2
I need to group nodes using Term 1.1, Term 1.2, Term 2.1 and so on, regardless of how deep the term on a node is. For node tagged with Term 1.2.1.1 I still would need it to appear in the group of Term 1.2
One way that came to my mind was to establish two child-parent-grandparent relationship, but when I do so, the grandparent relationship cannot be used for Grouping field.
What would be the easiest way to do that then?
