Drab: (KeyError) key :current_user not found in: %{}

wlminimal

Hi I am using drab to update chart js in a page
here is defhandler

  defhandler show_dashboard_stats(socket, sender) do
    order_id = sender.params["campaign_id"]
    user_id = socket.assigns.current_user_id
    order = Sales.get_order_by_id(order_id, user_id)
    message_status = Messenger.get_all_message_status(order_id)

    total_sent = Enum.count(message_status)
    deilvered_count = Analytics.get_delivered_message_status_count(message_status)
    undelivered_count = Analytics.get_undelivered_message_status_count(message_status)
    bitly = Bitly.get_bilty_by_order_id(order_id)
    total_clicks = Analytics.load_clicks(bitly)

    poke socket,
                total_sent: total_sent,
                deilvered_count: deilvered_count,
                undelivered_count: undelivered_count,
                total_clicks: total_clicks,
                recent_order: order
    socket |> exec_js!("DashboardChart.update()")
  end

and here is error message.

** (KeyError) key :current_user not found in: %{}
    (texting) lib/texting_web/templates/dashboard/dashboard/index.html.drab:164: TextingWeb.Dashboard.DashboardView."index.html"/1
    (phoenix) lib/phoenix/view.ex:332: Phoenix.View.render_to_iodata/3
    (phoenix) lib/phoenix/view.ex:339: Phoenix.View.render_to_string/3
    (drab) lib/drab/live.ex:662: Drab.Live.rerender_template/4
    (drab) lib/drab/live.ex:617: Drab.Live.process_poke/9
    (texting) lib/texting_web/commanders/dashboard/dashboard_commander.ex:17: TextingWeb.Dashboard.DashboardCommander.show_dashboard_stats/2
    (drab) lib/drab.ex:323: anonymous fn/7 in Drab.handle_event/6

And I don’t understand

** (KeyError) key :current_user not found in: %{}

in my app.html.eex I passed current_user id to drab like this

<%= Drab.Client.run(@conn, [current_user_id: @conn.assigns.current_user.id, order_id: @conn.assigns.recipients.id]) %>

So I inspected socket assigns in defhandler
then it shows correct user id.

So where does this error (KeyError) key :current_user not found in: %{} come from?

Almost same defhandler works in other page.
what is the possible cause?

Thanks

14 comments

/phoenix #drab

0 3838 14

2018-08-10 08:45:30 UTC

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grych

Creator of Drab

I would start checking with this file, line 164. Can you show it?

Post #1

wlminimal

sure.
<div class=“stats”>
<i class=“material-icons”>access_time</i> You have <%= @conn.assigns.current_user.credits %> credits.
</div>

I assign :current_user using Plug in load_user.ex

def call(conn, _opts) do
    case user_id = get_session(conn, :user_id) do
    	user_id when user_id != nil ->
    		user = Account.get_user_by_id(user_id)
    		assign(conn, :current_user, user)
    	user_id when is_nil(user_id) ->
    		conn
    		|> put_flash(:error, "You must sign in first")
    		|> redirect(to: Helpers.sign_in_path(conn, :new))
        |> halt()
    end
  end

@conn.assigns.current_user

in router.ex

pipeline :dashboard do
    plug TextingWeb.Plugs.LoadUser
    plug TextingWeb.Plugs.DashboardLayout
    plug TextingWeb.Plugs.FetchRecipients
  end

Post #2

grych

Creator of Drab

So this is a conn case again.

Drab uses castrated version of conn, as it could be very heavy, especially when you keep a lot of data in assigns. See this issue for a reference. Drab creates it’s own version of conn, which by default copy only the few fields in private.

This behaviour is documented here. What you need is just to add something like :assigns => :current_user to :live_conn_pass_through config.

I know it is quite counter-intuitive, but I didn’t find any solution to change this, or at least tell user it is using the castrated conn version. Anyone?

Post #3

wlminimal

OK. I did it exactly you and doc said.
and then I got this error

(Protocol.UndefinedError) protocol Enumerable not implemented for %Texting.Account.User{…}

`
What am I missing?

Post #4

grych

Creator of Drab

Ok, still I need way more information. On which line of code the error occurs and what’s there? What exactly you’ve set as :live_conn_pass_through in the config? What is %Texting.Account.User{}?

Post #5

wlminimal

%Texting.Account.User{} is a user struct that I assign to conn as current_user.

live_conn_pass_through: %{
    assigns: %{
      current_user: true
    },
    private: %{
      phoenix_endpoint: true
    }

Post #6

grych

Creator of Drab

OK, what about which line of code the error occurs and what’s there?

Post #7

wlminimal

That is tricky. I thought errors from <%= @conn.assigns.current_user.credits %>
So I comment out that lines but it got me same errors.

And after set :live_conn_pass_through, drab in other page gives me an same error. (it worked ok before set :live_conn_pass) and some other page it shows me errors like this

** (Protocol.UndefinedError) protocol Enumerable not implemented for %Texting.Account.User{}
long line here.......and

(elixir) /home/ubuntu/bob/tmp/6f24db0ee55f44e6b3c1cfcd7feddfd8/elixir/lib/elixir/lib/enum.ex:1: Enumerable.impl_for!/1
    (elixir) /home/ubuntu/bob/tmp/6f24db0ee55f44e6b3c1cfcd7feddfd8/elixir/lib/elixir/lib/enum.ex:141: Enumerable.reduce/3
    (elixir) lib/enum.ex:1911: Enum.reduce/3
    (drab) lib/drab/live/assign.ex:71: anonymous fn/2 in Drab.Live.Assign.deep_merge_map/2
    (stdlib) maps.erl:257: :maps.fold_1/3
    (drab) lib/drab/live/assign.ex:71: anonymous fn/2 in Drab.Live.Assign.deep_merge_map/2
    (stdlib) maps.erl:257: :maps.fold_1/3
    (drab) lib/drab/live/assign.ex:33: Drab.Live.Assign.merge/2
    (drab) lib/drab/live.ex:898: Drab.Live.apply_conn_merge/1
    (elixir) lib/enum.ex:1298: anonymous fn/3 in Enum.map/2
    (stdlib) maps.erl:257: :maps.fold_1/3
    (elixir) lib/enum.ex:1915: Enum.map/2
    (drab) lib/drab/live.ex:894: Drab.Live.assigns_for_partial/5
    (drab) lib/drab/live.ex:584: Drab.Live.do_poke/5
    (drab) lib/drab.ex:323: anonymous fn/7 in Drab.handle_event/6

Post #8