getter.clj

(def graph {:roots {} :nodes {}})

;; end up wit ha structure like this after adding a node
(def graph {:roots {} :nodes {'Organization {:fields {:id {}}}}})

;; do I do this?
(let [field (get-in graph [:nodes 'Organization :fields :id])]
  ;; ...
  )

;; or ...
(defn get-field [graph node name]
  (get-in graph [:nodes node :fields name]))