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constraints.clj
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constraints.clj
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;; Copyright (C) 2020 SURFnet B.V.
;;
;; This program is free software: you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by the Free
;; Software Foundation, either version 3 of the License, or (at your option)
;; any later version.
;;
;; This program is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
;; more details.
;;
;; You should have received a copy of the GNU General Public License along
;; with this program. If not, see http://www.gnu.org/licenses/.
(ns nl.surf.demo-data.constraints)
(defn unique
"Constraint to check that generated values don't already occur in
world."
[{:keys [world attr]} val]
(let [entity-type (-> attr :name namespace keyword)]
(not-any? #(= % val) (map (:name attr) (get world entity-type)))))