handle application_id correctly

lib/workload_service/events/task.ex

@@ -5,12 +5,19 @@ defmodule WorkloadService.Events do
   """
 
   alias WorkloadService.Aggregates.TaskId
+  alias WorkloadService.Aggregates.ApplicationId
 
   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)}
+          event = %{event | id: TaskId.new(org_id, type, task_id)}
+
+          if Map.has_key?(event, :application_id) && is_map(event.application_id) do
+            %{event | application_id: ApplicationId.parse!(event.application_id)}
+          else
+            event
+          end
         end
 
         def decode(event), do: event