Hi

how can I create a spec for a map like

{"2018-01-01": {:value 10}, "2018-03-22: {:value 20}}

map where keys are dates

write a function that decides whether that is a valid string - that function is your predicate

(s/def ::date valid-date?)
(s/def ::value int?)
(s/def ::data (s/keys :req-un [::value]))
(s/def ::m (map-of ::date ::data))

tks Alex, pretty much what I had, problem must be somewhere else.

@mping you might want to add :conform-keys true to map-of

with a pred, the keys will will just conform to themselves, so that’s just making it slower

@alexmiller in what cases would conform-keys be needed?

core specs?

cases where the keys need to be conformed

:)

most maps have keys that are strings, numbers, keywords, uuids, etc - all of which conform to themselves, so there is no reason to conform the map keys

but if you had a map whose keys conformed to a value other than themselves (a regex spec, an s/or, a nested map, etc) then you would want to consider it

but even in that case, you have to think carefully to make sure the conformed values don’t create a case where two map keys have the same conformed value. if so, they will collide in the conformed map.

I see.

thanks guys