is the namespace + var of the attribute predicate in your process?

You should be able to do (requiring-resolve sym-of-the-attr-predicate)

in a repl

@U70QFSCG2, hey, were you able to make this work? I now face the same issue, while all namespaces with predicates were required and loaded.

You also need to make sure the symbol is fully qualified in the query

because queries are typically quoted ' this is easy to overlook

Yeah, I believe everything is fine with the symbol and its quoting. I managed to move a bit further though.

I’ve included datomic/ion-config.edn to my project’s resources because, as it turns out, all such predicates must be explicitly listed as allowed there (even if you’re not developing an Ion).

This helped to resolve the previous error, but I now face another one:

Execution error (ExceptionInfo) at datomic.ion.resolver/anomaly! (resolver.clj:41).
''grossbuchbot.db-queries.datomic.entity-preds/valid-chat?' needs to be listed under :allow in datomic/ion-config.edn

My ion-config.edn looks like this:

{:allow [grossbuchbot.db-queries.datomic.entity-preds/valid-chat?
         grossbuchbot.db-queries.datomic.entity-preds/valid-chat-data?
         grossbuchbot.db-queries.datomic.entity-preds/matching-data-exists?]
 :app-name "<the_same_system_that_is_diverted_locally>"}

So far I’ve managed to check that: • the ion-config.edn file is actually picked up — whenever I move it or rename, I receive the previous error:

Execution error (ExceptionInfo) at datomic.core.require/anomaly! (require.clj:53).
Unable to load namespace for 'grossbuchbot.db-queries.datomic.entity-preds/valid-chat?

is your “callsite” possibly double-quoted?

• replacing specific symbols in :allow vector with a wildcard doesn’t help — put grossbuchbot.db-queries.datomic.entity-preds/*, received the same error ''grossbuchbot.db-queries.datomic.entity-preds/valid-chat?' needs to be listed under :allow in datomic/ion-config.edn

I ask just because of the quote in the error message: for 'grossbuc,,,

Yeah, I reflected whatever was in the https://docs.datomic.com/cloud/schema/schema-reference.html#entity-predicates:

{:db/ident :chat/validate
 :db.entity/attrs [:chat/id :chat/type]
 :db.entity/preds 'grossbuchbot.db-queries.datomic.entity-preds/valid-chat?}

whether that should be quoted or not depends on the outer context of this map

if it’s code (e.g. a def in a ns) it should be quoted; if it’s slurped out of an edn file, it shouldn’t be

Yeah, it’s within the EDN file, so it obviously doesn’t require that ' .

Thank you Francis*!* It would be great, if the schema reference could be updated with this minor but crucial detail. Something along the lines of:

with-db is a stateful value kept by the remote side

in on-prem, that db is just a db object with extra novelty on it; but in cloud it has to be retained by the server and you get a reference to it

this also means you need to ensure session-stickiness, and you might lose access to it

oddly there’s no explicit resource management so I have no idea how you release it or when it is released.

oh because in cloud the with-db is remote from the app, so you have to move the speculative txn from app to query server and hopefully only once

yes, “with-db” is “make a with-db and give me a pointer to it”

thank you