(ns spec-test.core
(:require [clojure.spec :as s]))
(s/def :user/name string?)
(s/def :common/user (s/keys :req [:user/name]))
; first version of name (using :pre)
(defn name [user]
{:pre [(s/valid? :common/user user)]}
(-> user :user/name))
; This statement works ok and returns "Elon":
(name {:user/name "Elon"})
; but this statement...
(name {:x "Elon"})
;...will throw:
CompilerException java.lang.AssertionError:
Assert failed: (s/valid? :common/user user)
; ...but then I don't get as much information
; about the error as if I would have called:
(s/explain :common/user {:x "Elon"})
;...which also contains the predicate:
val: {:x "Elon"} fails spec: :common/user
predicate: (contains? % :user/name)
; (second version of name - more verbose)
; or do I need to wite it like this:
(defn name [user]
(let [parsed (s/conform :common/user user)]
(if (= parsed ::s/invalid)
(throw (ex-info "Invalid input" (s/explain-data :common/user user)))
(-> user :user/name))))
; so that:
(name {:x "Elon"})
; ...will return:
CompilerException clojure.lang.ExceptionInfo:
Invalid input #:clojure.spec{:problems}
({:path [], :pred (contains? % :user/name),
:val {:x "Elon"}, :via [:common/user], :in []})
; It should be nice if I could be able to write it like this
; (or similar, to get a better error message):
(defn name [user]
{:pre [(s/explain :common/user user)]}
(-> user :user/name))
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