impl string.chars

lib/customer_service/aggregates/customer_id.ex

@@ -4,7 +4,7 @@ defmodule CustomerService.Aggregates.CustomerId do
           customer_type: String.t(),
           customer_id: String.t()
         }
-  @derive {Jason.Encoder, only: [:org_id, :customer_type, :customer_id]}
+  @derive Jason.Encoder
   defstruct [:org_id, :customer_type, :customer_id]
 
   def new(org_id, customer_type, customer_id)
@@ -30,12 +30,14 @@ defmodule CustomerService.Aggregates.CustomerId do
     {:error, :invalid_customer_id}
   end
 
-  def to_string(%__MODULE__{
-        org_id: org_id,
-        customer_type: customer_type,
-        customer_id: customer_id
-      }) do
-    org_id <> ":" <> customer_type <> ":" <> customer_id
+  defimpl String.Chars do
+    def to_string(%CustomerService.Aggregates.LeadId{
+          org_id: org_id,
+          customer_type: type,
+          customer_id: customer_id
+        }) do
+      org_id <> ":" <> type <> ":" <> customer_id
+    end
   end
 
   defimpl Commanded.Serialization.JsonDecoder do