Clojurians Log v2

Hey! :db.unique/identity isn't actually supported by XTDB. the docs for transactions in v1 are here: https://v1-docs.xtdb.com/language-reference/datalog-transactions/. It's fairly low-level, hence Biff adding its own transaction stuff on top. XT v1 basically has two ways to enforce uniqueness: either by encoding everything you want to be unique inside the :xt/id value, or by using a transaction function (which in turn would just do a regular query to see if there's more than one document with a given attribute value). Biff defines a :biff/ensure-unique transaction function which does the latter; see this page: https://biffweb.com/docs/reference/transactions/

I was beginning to suspect XTDB might not do that... Oh well. Does biff handle 'this key in the schema for :xt/id matches this other part, therefore grab that value instead of generating a UUID?'

I.e. like a datomic lookup ref? no unfortunately, though there are some lookup-* helper functions you can use to query for IDs before submitting a transaction: https://biffweb.com/docs/api/xtdb/

there is also :db.op/upsert (also on https://biffweb.com/docs/reference/transactions/ ) which may or may not do what you need.

Just noting from the tutorial that there was a pattern of declaring, for example :subscription/id at the top level of the schema and then referencing that in the malli type later, and that that could mayhap be leveraged to improve on the id autofilling.

Regardless, thank you for the tool, I'm not certain if I'll stick with it, but Biff has certainly been full of thought provoking ideas. I particularly like the minimal DI setup/module system.

for sure--that's kinda one of my goals for biff, i.e. even if you don't end up using it, it's still a worked example of how you could make a clojure web app, and you can take inspiration from whichever parts seem interesting etc for biff 2 so far I haven't layered anything on top of regular sqlite transactions, other than honeysql, but it could be interesting to explore doing something in that space. e.g. sort of like a write-side version of biff.graph that I just released which gives you more of a graph view over your data instead of a relational view.