Clojurians Log v2

Do you even need the lookup ref there?

@sfyire you don’t need the lookup ref, as zane said. Internally, lookup refs are resolved to the :db/id of the specific entity, so what you have written is “redundant”. If charlie-id is indeed a :db/id, then you can transact the link directly:

(datahike/transact
  connection
  {:tx-data [{:db/id bob-id, :best-friend charlie-id}]})

Thank you for the information, what's the significance of :tx-data? I'm not at my laptop but I thought I could do non ref based updates without the :tx-data key I just assumed I could update anything with that "syntax"

@sfyire you’re correct in that you can process transactions without using the :tx-data key, and can pass the sequence directly. I believe that it’s there in order to be compatible with Datomic (where its use is mandated). Datahike is based on the Datascript project, where the syntax is a bit “looser”.

Datomic supports an additional :timeout key as well, so the map form is more open in the options it can accept.

@cjsauer oh I see so I would need to add :tx-data all the time in updates for Datomic? But Datascript and thus Datahike will accept without a :tx-data in some circumstances?

@sfyire right. If compatibility with Datomic is important, for example if you foresee one day migrating, then it might be better to use the more portable map form. This is my impression anyway. Others here might have more insight.