silk.clj

(defrecord User [id])


; --------------------
; unmatch on Routes

(def routes
  (silk/routes [[User ["users" (silk/integer :id)]]]))

(silk/unmatch routes User (User. 42)) ; you can use a record as a params map

; or use a helper function to generate a URL
(defn unmatch-type [rtes obj]
  (silk/unmatch rtes (type obj) obj))


; --------------------
; unmatch on Route

(def user-route
  (silk/route [User ["users" (silk/integer :id)]]))

(silk/unmatch user-route (User. 42))


; --------------------
; implement `Pattern` and unmatch on type directly

(extend-protocol silk/Pattern
  User
  (-unmatch [this _]
            (silk/url {:path ["users" (-> this :id str)]})))

(silk/unmatch (User. 42) {})

; I would consider adding a unary version of `unmatch` if this last one is a common request