Wrap default merge migrate to default to compassus route queries

wrapped-migrate-merge.clj

(defn my-merge
  [routes]
  (fn
    [reconciler state res query]
    (om/default-merge reconciler state res (or query
                                               (om/get-query (get routes (:compassus.core/route state)))))))

;; also pass the wrapper component for the compassus app
(defn my-migrate
  [routes wrapper]
  (fn [app-state-pure query tempids id-key]
    (let [query (if (= :compassus.core/route (first query)) ; assume a full query here means om substituted the root query for a nil query
                  (om/get-query (get routes (:compassus.core/route app-state-pure)))
                  query)
          ;; If tempids is not empty, om/default-migrate does a (om/tree->db (om/db->tree)) to update all of the tempid refs.
          ;; This will remove any state not in the query. Combine the wrapper query with the route query to prevent this undesireable feature
          query (if (and wrapper (not (empty? tempids)))
                  (apply vector (concat (om/get-query wrapper) query))
                  query)]
      (om/default-migrate app-state-pure query tempids id-key))))

;; This is given to the reconciler as (partial sender websocket-options)
(defn sender
  [send-options {:keys [remote] :as q} cb]
  (when remote
    (let [{:keys [query rewrite]} (om/process-roots remote)
          cb' (fn [result]
                (if (some #(symbol? (first %)) result)
                  (cb result nil) ;; we default to the current route's query in merge/migrate
                  (cb (rewrite result) remote)))]
      (websocket/send [:parser/remote query]
                      #(if (= % :chsk/timeout)
                         (cb {'app/timeout {:fail-message "Timeout waiting for response"}} [:fail-message])
                         (cb' %))
                      send-options))))

We set compassus/parser :route-dispatch to false