You can reference the _uuid value as:
- ${instanceID}
- /data/meta/instanceID.
So, you can create a variable as calculate type (or as string) with one of these expressions as calculation.
Sorry, I didn’t find the way to get/reference the _id value. @Kal_Lam, @Josh, @jnm or @ks_1 might help here, please. _id is probably not available before submission?
“It is literally the primary key of a relational database table.” See Submission duplication after version 2.023.2 - #13 by jnm.
This post (2021) says
`KoBoCAT REST API.json includes the unique _id.
Submission id column missing from API V1 requests - #5 by jnm
