Library Widget

[jhrr]

• Add a POC for a custom dump_tree serializer on the Node model that allows us to slice into the tree arbitrarily and send it to the frontend in order to visualize tree data when standing outside of a single text. As we move into dealing with more library/meta URN paths, generalising this seemed the right way to go.
• Mirror the up_to element of the URN API when resolving trees.
• Add a TreeNode and resolver logic to the schema. As the query of this data type is not strictly tied to a Django model I've implemented this in the simplest way I could find (via ObjectType) and I suspect @jacobwegner will have a better idea about if we need to rationalise the approach and how to do that.
• Allow the easy lookup of a Node from its corresponding URN. Cache the lookup on the instance.

Notes

As a result of the first point above (dealing with more library-side/meta URN values) I've noticed our URN.py and URN.js utilities are lagging behind a bit and neither can parse a 'partial' URN like urn:cts:greekLit:, for example. This was fine up to now as we were only really dealing with full passage URNs, but as we move further up the tree the implementations are starting to fail. The JavaScript version is particularly in need of some attention and it would be good if we implemented an analogous method as up_to in there. I looked into fixing this up during the week but considering time demands it was larger of a job than I wanted to add to my plate and it would be nice to do it properly. I have an entire checklist of various URN abstraction related points that I'd like to make into a ticket, and as I mentioned to @jtauber maybe these could be done alongside the CTS URN widget, which still needs to be ported.

Related PRs

• https://github.com/scaife-viewer/sv-mini/pull/1
• https://github.com/scaife-viewer/scaife-widgets/pull/15

[jacobwegner]

@jhrr I've approved this PR; I think there are definitely more conversations to be had to help shape the "library" use case and improving our URN toolset as you've alluded to (have a URN.py and URN.js card in Trello that I've linked your PR body to as a TODO)

[jhrr]

@jacobwegner yep I agree, the space around this is definitely opening up but I also feel there is still lots of refinement to be made. Thanks for the review!