The e/server closure reaches all the way into Entity-item. Wrap (Entity-item. id name #(swap! !state assoc :selected id)) with e/client. Secondly, change #(swap! !state assoc :selected id) to an e/fn and stick e/server inside of it.

And then you need to call it with (on-select.)

Alternatively,

(e/defn Entity-item [id name OnSelect]
  (e/client
    (dom/div
      (dom/a
        (dom/on "click" OnSelect)
        (dom/text id))
      (dom/text name))))


(e/defn Entity-list []
  (let [!state (atom {})
        state  (e/watch !state)]
    (e/server
      (e/for-by :db/id [item (pull-table (get-db) :a.o.r.chat.pl {:user/id 6})]
        (let [id   (:db/id item)
              name (: item)]
          (Entity-item. id name (e/fn [_]
                                  (e/server
                                    (swap! !state assoc :selected id)))
            ...))))))

Hi @U06B8J0AJ thank you very much. I wrapped the entity-item with a e/client which I shouldn have from the start. Thank you:

(e/defn Entity-list []
  (let [!state (atom {})
        state (e/watch !state)]
    (e/server
     (e/for-by :db/id [item (pull-table (get-db) :a.o.r.chat.pl {:user/id 6})]
               (let [id (:db/id item)
                     name (: item)]
                 (e/client 
                   (Entity-item. id name #(swap! !state assoc :selected id)))

Ah, so !state is on the client, I thought it was server-side. Generally helpful to future you (and incidentally good preparation for future versions of Electric) is to start your functions with e/client or e/server.

yes, adding them definately simplifies debugging

and yes, client side

i'm very intrigude by your key name :a.o.r.chat.pl

the luxurious days of paying no attention to function definition sequence will soon be behind us wistful nostalgic tears

🙂 it's actually something well crafted, it's not just a random thing