Update Publisher to sync only a new non-local data.

test/decentralised_book_index/sync/sync/publisher_sync_test.exs

@@ -29,12 +29,9 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.PublisherSyncTest do
       assert :ok = PublisherSync.create_update(publisher, server.id)
       assert {:ok, saved_publisher} = Metadata.get_publisher_by_id(publisher.id)
 
-      publisher =
-        publisher
-        |> Map.replace(:inserted_at, inserted_at)
-        |> Map.replace(:updated_at, updated_at)
+      publisher = datetime_from_iso8601_for_map(publisher)
 
-      assert publisher = saved_publisher
+      assert get_submap(saved_publisher, publisher) == publisher
       assert server.id == saved_publisher.dbi_server_id
     end
 
@@ -42,19 +39,64 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.PublisherSyncTest do
       server = generate(dbi_server(url: @test_server_endpoint))
 
       {:ok, publisher} = Metadata.create_publisher("Publisher", actor: user)
+      {:ok, publisher} = Metadata.assign_publisher_dbi_server(publisher, server.id, actor: user)
 
       publisher_attrs = %{
         id: publisher.id,
         name: "Publisher",
         inserted_at: "2025-03-21T09:20:48.791539Z",
+        updated_at: datetime_add_second_as_string(publisher.updated_at, 10),
+        dbi_server_id: server.id
+      }
+
+      assert :ok = PublisherSync.create_update(publisher_attrs, server.id)
+      assert {:ok, saved_publisher} = Metadata.get_publisher_by_id(publisher.id)
+
+      publisher_attrs = datetime_from_iso8601_for_map(publisher_attrs)
+
+      assert get_submap(saved_publisher, publisher_attrs) == publisher_attrs
+      assert server.id == saved_publisher.dbi_server_id
+    end
+
+    test "the local existing publisher wouldn't updated", %{user: user} do
+      server = generate(dbi_server(url: @test_server_endpoint))
+
+      {:ok, publisher} = Metadata.create_publisher("Publisher", actor: user)
+
+      publisher_attrs = %{
+        id: publisher.id,
+        name: "Updated Publisher",
+        inserted_at: "2025-03-21T09:20:48.791539Z",
         updated_at: "2025-03-21T09:20:48.791539Z"
       }
 
       assert :ok = PublisherSync.create_update(publisher_attrs, server.id)
       assert {:ok, saved_publisher} = Metadata.get_publisher_by_id(publisher.id)
 
-      assert publisher_attrs = saved_publisher
-      assert server.id == saved_publisher.dbi_server_id
+      assert get_submap(saved_publisher, publisher_attrs) != publisher_attrs
+      assert saved_publisher.name == "Publisher"
+      assert saved_publisher.dbi_server_id == nil
+    end
+
+    test "old publisher wouldn't be sync", %{user: user} do
+      server = generate(dbi_server(url: @test_server_endpoint))
+
+      {:ok, publisher} = Metadata.create_publisher("Publisher", actor: user)
+      {:ok, publisher} = Metadata.assign_publisher_dbi_server(publisher, server.id, actor: user)
+
+      publisher_attrs = %{
+        id: publisher.id,
+        name: "Old Publisher",
+        inserted_at: "2022-03-21T09:20:48.791539Z",
+        updated_at: "2022-03-21T09:20:48.791539Z",
+        dbi_server_id: server.id
+      }
+
+      assert :ok = PublisherSync.create_update(publisher_attrs, server.id)
+      assert {:ok, saved_publisher} = Metadata.get_publisher_by_id(publisher.id)
+
+      assert get_submap(saved_publisher, publisher_attrs) != publisher_attrs
+      assert saved_publisher.name == "Publisher"
     end
   end
 end