server - update view count on threads

lib/myapp/data/reply.ex

@@ -44,7 +44,7 @@ defmodule MyApp.Data.Reply do
     thread_id = Map.get(reply, :thread_id)
     user_id = Map.get(reply, :user_id)
     query = from t in Data.Thread, where: t.id == ^thread_id,
-      update: [set: [last_reply_id: ^user_id], inc: [reply_count: 1]]
+      update: [set: [last_reply_id: ^user_id, updated_at: ^DateTime.utc_now], inc: [reply_count: 1]]
 
     case Repo.update_all(query, []) do
       nil -> {:error, "update thread error"}

lib/myapp/data/thread.ex

@@ -110,6 +110,14 @@ defmodule MyApp.Data.Thread do
     end
   end
 
+  # this doesn't update the 'updated_at' field which is what we want
+  def update_view_count(thread_id) do
+    query = from t in Data.Thread,
+      update: [inc: [view_count: 1]],
+      where: t.id == ^thread_id
+    Repo.update_all(query, [])
+  end
+
   # TODO: delete thread
 
   defp process_user_update(thread, _params) when is_nil(thread), do: {:error, "Invalid thread"}