pathom-playground.clj

(ns dev.pathom-playground
  (:require [com.wsscode.pathom3.connect.indexes :as pci]
            [com.wsscode.pathom3.connect.operation :as pco]
            [com.wsscode.pathom3.interface.eql :as p.eql]))

;; that one works fine
(pco/defresolver timezone-resolver [item]
  {::pco/input  [:timezone/id]
   ::pco/output [:timezone/label]}
  {:timezone/label (str "label for id " (:timezone/id item))})

;; that one (batched) is buggy
(pco/defresolver timezone-batch-resolver [items]
  {::pco/input  [:timezone/id]
   ::pco/output [:timezone/label]
   ::pco/batch? true}
  (mapv (fn [item]
          {:timezone/label (str "label for id " (:timezone/id item))})
        items))

(pco/defresolver item-checks [item]
  {::pco/input  [{(pco/? :item/timezone) [:timezone/id :timezone/label]}]
   ::pco/output [:item/checks]}
  {:item/checks {:timezone-id?    (some? (get-in item [:item/timezone :timezone/id]))
                 :timezone-label? (some? (get-in item [:item/timezone :timezone/label]))}})

(comment
  ;; KO, timezone/label is not resolved
  (p.eql/process
    (pci/register [timezone-batch-resolver
                   item-checks])
    {:item/name     "my item"
     :item/timezone {:timezone/id "UTC"}}
    [:item/checks])
  ;; => #:item{:checks {:timezone-id? true, :timezone-label? false}}

  ;; OK, both timezone/id and timezone/label are found
  (p.eql/process
    (pci/register [timezone-resolver
                   item-checks])
    {:item/name     "my item"
     :item/timezone {:timezone/id "UTC"}}
    [:item/checks])
  ;; => #:item{:checks {:timezone-id? true, :timezone-label? true}}
  )