chore(update_channel): better errors

using the upstream branch of `ash_graphql` to handle errors in the
`update_channel` resource, this commit should be squashed to the
previous one when `ash_graphql` releases a new version.

Signed-off-by: Luca Zaninotto <[email protected]>

backend/lib/edgehog/update_campaigns/update_channel/error_handler.ex

@@ -0,0 +1,49 @@
+#
+# This file is part of Edgehog.
+#
+# Copyright 2025 SECO Mind Srl
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+defmodule Edgehog.UpdateCampaigns.UpdateChannel.ErrorHandler do
+  @moduledoc false
+
+  def handle_error(error, context) do
+    %{action: action} = context
+
+    case action do
+      :create -> target_ids_translation(error)
+      :update -> target_ids_translation(error)
+      _ -> error
+    end
+  end
+
+  defp target_ids_translation(error) do
+    if missing_target_ids?(error) do
+      %{
+        error
+        | fields: [:target_group_ids],
+          message: "One or more target groups could not be found"
+      }
+    else
+      error
+    end
+  end
+
+  defp missing_target_ids?(error) do
+    error[:code] == "not_found"
+  end
+end

backend/lib/edgehog/update_campaigns/update_channel/update_channel.ex

@@ -1,7 +1,7 @@
 #
 # This file is part of Edgehog.
 #
-# Copyright 2023-2024 SECO Mind Srl
+# Copyright 2023-2025 SECO Mind Srl
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@ defmodule Edgehog.UpdateCampaigns.UpdateChannel do
 
   alias Edgehog.UpdateCampaigns.UpdateChannel.Calculations
   alias Edgehog.UpdateCampaigns.UpdateChannel.Changes
+  alias Edgehog.UpdateCampaigns.UpdateChannel.ErrorHandler
 
   resource do
     description """
@@ -40,6 +41,8 @@ defmodule Edgehog.UpdateCampaigns.UpdateChannel do
 
   graphql do
     type :update_channel
+
+    error_handler {ErrorHandler, :handle_error, []}
   end
 
   actions do

backend/mix.exs

@@ -114,7 +114,7 @@ defmodule Edgehog.MixProject do
       {:credo, "~> 1.6", only: [:dev, :test], runtime: false},
       {:ash, "~> 3.0"},
       {:ash_postgres, "~> 2.0"},
-      {:ash_graphql, "~> 1.0"},
+      {:ash_graphql, github: "ash-project/ash_graphql"},
       {:ash_json_api, "~> 1.3"},
       {:picosat_elixir, "~> 0.2"},
       {:styler, "~> 1.0.0-rc.1", only: [:dev, :test], runtime: false},