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2021-04-07
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I'm having trouble with datomic client q
api, where the aggregate function count
returns an empty list instead of 0 if no items were found. What am I doing wrong here? Thanks in advance
(d/q '[:find (count ?e)
:where [?e :migration/name "non_existing_name"]]
db) ;; => [] instead of [[0]]
if you want to save the bandwidth of returning all items, you can use 0 as a fallback e.g. (or (ffirst result) 0)
noted, thanks for the tip @U09R86PA4