add dialyzer and fix id

lib/workload_service/aggregates/quote_task.ex

@@ -1,7 +1,8 @@
 defmodule WorkloadService.Aggregates.QuoteTask do
   use WorkloadService.Aggregates.Task,
     task_type: "quote",
-    commands: WorkloadService.Commands.QuoteTask
+    commands: WorkloadService.Commands.QuoteTask,
+    submission_type: map()
 
   def validate_submission(_) do
     :ok

lib/workload_service/aggregates/solicitation_task.ex

@@ -1,7 +1,8 @@
 defmodule WorkloadService.Aggregates.SolicitationTask do
   use WorkloadService.Aggregates.Task,
     task_type: "solicitation",
-    commands: WorkloadService.Commands.SolicitationTask
+    commands: WorkloadService.Commands.SolicitationTask,
+    submission_type: map()
 
   def validate_submission(_) do
     :ok

lib/workload_service/aggregates/task.ex

@@ -8,24 +8,37 @@ defmodule WorkloadService.Aggregates.Task do
       use WorkloadService.Aggregates.Task,
         task_type: "quote"
     end
-  """
 
-  @type t :: %__MODULE__{
-    id: WorkloadService.Aggregates.TaskId.t() | nil,
-    application_id: WorkloadService.Aggregates.ApplicationId.t() | nil,
-    task_info: map() | nil,
-    submission: map() | nil,
-    attachments: [String.t()],
-    status: String.t() | nil
-  }
+  ## With custom submission type
+
+    defmodule QuoteTaskWithCustomSubmission do
+      defmodule CustomSubmission do
+        @type t :: %{...custom_fields: term()}
+      end
+
+      use WorkloadService.Aggregates.Task,
+        task_type: "quote",
+        submission_type: CustomSubmission.t()
+    end
+  """
 
   @callback validate_submission(map()) :: :ok | {:error, term()}
 
   defmacro __using__(opts) do
     task_type = Keyword.fetch!(opts, :task_type)
     commands_module = Keyword.get(opts, :commands, WorkloadService.Commands.Task)
+    submission_type = Keyword.get(opts, :submission_type, quote(do: map()))
 
     quote do
+      @type t :: %__MODULE__{
+              id: WorkloadService.Aggregates.TaskId.t() | nil,
+              application_id: WorkloadService.Aggregates.ApplicationId.t() | nil,
+              task_info: map() | nil,
+              submission: unquote(submission_type) | nil,
+              attachments: [String.t()],
+              status: String.t() | nil
+            }
+
       @behaviour Commanded.Aggregates.Aggregate
       @task_type unquote(task_type)