In a lot of tutorials, I see tempid being used where it seems to serve no purpose. Here ’s an example from a friendly walkthrough: (d/transact conn [{:db/id (d/tempid :db.part/user) :owner/name "Bob" :owner/dogs [{:db/id (d/tempid :db.part/user) …

The use of d/tempid

marshall January 31, 2019, 4:45pm 5

That is also correct Dustin.

When To Use :db/id

Topic		Replies	Views
Unusual behavior for "datomic.tx" as a tempid Client API	2	177	July 2, 2025
datomic.db.DbId tempids vs String tempids as arguments to queries Datomic Pro	0	327	February 28, 2023
Resolve actual IDs from temporary IDs in case of communication failures during transaction executing Datomic Pro	1	43	December 11, 2024
When To Use :db/id General	5	3535	August 1, 2019
Lookup Ref is interpreted as a tempid String, resulting in "tempid _ used only as value in transaction" Troubleshooting	2	606	February 28, 2023