Install db/fn using datomic client api

[c***@shh.mpg.de]

I would like to use the diatomic client api but I am having trouble
installing db/fn.

I get:

[{:type java.lang.RuntimeException

:message "java.lang.Exception: Not supported: class clojure.lang.Delay"

:at [com.cognitect.transit.impl.WriterFactory$2 write
"WriterFactory.java" 150]}


when trying to transact:


(def rj-f (d/function

{:lang "clojure"

:params '[db job-id]

:code

'(let [result (datomic.api/q '[:find ?s

:in $data ?job-id

:where [$data ?e :job/id
?job-id]

[$data ?e :job/status
?s]]

db

job-id)

status (ffirst result)

heartbeat (quot (System/currentTimeMillis) 1000)]

(if-not (#{:finished :aborted :failed} status)

[[:db/add [:job/id job-id] :job/status :started]

[:db/add [:job/id job-id] :job/heartbeat heartbeat]]

(throw (ex-info (format "Job %s: status %s not eligible
for start." job-id status)

{:overseer/error :ineligible}))))}))


(def ^:no-doc reserve-job-tx-list

"Datomic database function to atomically reserve a job (mark as started

and include initial heartbeat)

Either reserves the given job id, or throws."

[{:db/ident :reserve-job

:db/fn rj-f}])