my file tree looks something like this:
pages
journeys
journey
day
journeys:
content:
items: @self.children
journey:
content:
items: @self.children
how can I address nested collections in code?
thank you!
I think the best option is to use taxonomy for your collection rather than @self.children so that way you will have much more control.
could you provide some code as an idea ? Thanks!
You assign a taxonomy to the pages (a tag or a category), and you ask Grav to build a collection from such taxonomy, like explained in Taxonomy Collections
code? 
or: what fits where?