Update DBIServerTransformer to fetch the dbi_server relationship.

lib/decentralised_book_index/sync/data_transformers/dbi_server_transformer.ex

@@ -13,7 +13,9 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.DBIServerTransformer do
         name: get_in(json_body, ["attributes", "name"]),
         url: get_in(json_body, ["attributes", "url"]),
         inserted_at: get_in(json_body, ["attributes", "inserted_at"]),
-        updated_at: get_in(json_body, ["attributes", "updated_at"])
+        updated_at: get_in(json_body, ["attributes", "updated_at"]),
+        # relationship
+        dbi_server_id: get_in(json_body, ["attributes", "dbi_server_id"])
       }
 
     {:ok, attrs}

test/decentralised_book_index/sync/data_transformers/dbi_server_transformer_test.exs

@@ -8,6 +8,7 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.DBIServerTransformerTest
       json_body = %{
         "data" => %{
           "attributes" => %{
+            "dbi_server_id" => "0c0647ec-07ef-4caa-b683-5847dbfbe5cc",
             "inserted_at" => "2025-03-22T20:07:30.766249Z",
             "name" => "Test",
             "updated_at" => "2025-05-04T18:48:44.213309Z",
@@ -16,7 +17,7 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.DBIServerTransformerTest
           "id" => "0c0647ec-07ef-4caa-b683-5847dbfbe5cc",
           "links" => %{},
           "meta" => %{},
-          "relationships" => %{},
+          "relationships" => %{"dbi_server" => %{"links" => %{}, "meta" => %{}}},
           "type" => "dbi_server"
         },
         "jsonapi" => %{"version" => "1.0"},
@@ -34,7 +35,8 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.DBIServerTransformerTest
                name: "Test",
                url: "http://localhost:4001",
                inserted_at: "2025-03-22T20:07:30.766249Z",
-               updated_at: "2025-05-04T18:48:44.213309Z"
+               updated_at: "2025-05-04T18:48:44.213309Z",
+               dbi_server_id: "0c0647ec-07ef-4caa-b683-5847dbfbe5cc"
              } = server
     end