core.cljs

(ns example.core
       (:require [goog.dom :as gdom]
                 [om.next :as om :refer-macros [defui]]
                 [om.dom :as dom]))

(def state nil)

(defmulti read om/dispatch)

(defmethod read :foo [_ _ _]
           {:value {}})

(defui Child
       static om/IQuery
       (query [this]
              [{:bar [:baz]}])
       Object
       (render [this]
               (dom/div nil "child"
                        (dom/button #js {:onClick (fn []
                                                      (om/set-state! this 55))}
                                    "Press Me"))))

(def child (om/factory Child))

(defui Parent
       static om/IQuery
       (query [this]
              [{:foo (om/get-query Child)}])
       Object
       (render [this]
               (dom/div nil
                        (child (:foo (om/props this))))))

(def reconciler
     (om/reconciler
      {:state state
       :parser (om/parser {:read read})}))

(om/add-root! reconciler
              Parent (gdom/getElement "app"))