implement a special decoder for the id

lib/workload_service/events/task.ex

@@ -1,39 +1,58 @@
 defmodule WorkloadService.Events do
   @moduledoc """
   All domain events for the workload service.
+  Contains helpers for common event functionality.
   """
 
-  defmodule TaskCreated do
+  alias WorkloadService.Aggregates.TaskId
+
+  defmacro __using__(_opts) do
+    quote do
+      defimpl Commanded.Serialization.JsonDecoder do
+        def decode(%{id: %{org_id: org_id, type: type, task_id: task_id}} = event) do
+          %{event | id: TaskId.new(org_id, type, task_id)}
+        end
+
+        def decode(event), do: event
+      end
+    end
+  end
+end
+
+defmodule WorkloadService.Events.TaskCreated do
   @moduledoc """
   Emitted when a new task is created (quote or solicitation).
   ID format: "org_id:type:task_id" (e.g., "test:quote:uuid") - TaskId struct
   """
+  use WorkloadService.Events
   @derive Jason.Encoder
   defstruct [:id, :application_id, :task_info, :attachments]
 end
 
-  defmodule SubmissionUpdated do
+defmodule WorkloadService.Events.SubmissionUpdated do
   @moduledoc """
   Emitted when submission is updated (user provides response data).
   """
+  use WorkloadService.Events
   @derive Jason.Encoder
   defstruct [:id, :submission, :attachments]
 end
 
-  defmodule SubmissionApproved do
+defmodule WorkloadService.Events.SubmissionApproved do
   @moduledoc """
   Emitted when submission is approved and ready to send.
   """
+  use WorkloadService.Events
   @derive Jason.Encoder
   defstruct [:id]
 end
 
-  defmodule TaskCompleted do
+defmodule WorkloadService.Events.TaskCompleted do
   @moduledoc """
   Emitted when task is completed and sent to policy-service.
   Triggers RabbitMQ publish.
   """
+  use WorkloadService.Events
   @derive Jason.Encoder
   defstruct [:id, :completed_by]
 end
-end