ensure name_at_post_time is set correctly

lib/philomena/comments.ex

@@ -39,10 +39,10 @@ defmodule Philomena.Comments do
       {:error, %Ecto.Changeset{}}
 
   """
-  def create_comment(image, attributes, params \\ %{}) do
+  def create_comment(image, user, attributes, params \\ %{}) do
     comment =
       struct(Comment, [image_id: image.id] ++ attributes)
-      |> Comment.creation_changeset(params)
+      |> Comment.creation_changeset(user, params)
 
     image_query =
       Image

lib/philomena/comments/comment.ex

@@ -31,9 +31,10 @@ defmodule Philomena.Comments.Comment do
   end
 
   @doc false
-  def creation_changeset(comment, attrs) do
+  def creation_changeset(comment, user, attrs) do
     comment
     |> cast(attrs, [:body, :anonymous])
+    |> set_name_at_post_time(user)
     |> validate_required([:body])
     |> validate_length(:body, min: 1, max: 300_000, count: :bytes)
   end
@@ -45,4 +46,9 @@ defmodule Philomena.Comments.Comment do
     |> validate_length(:body, min: 1, max: 300_000, count: :bytes)
     |> validate_length(:edit_reason, max: 70, count: :bytes)
   end
+
+  def set_name_at_post_time(changeset, nil), do: changeset
+  def set_name_at_post_time(changeset, %{name: name}) do
+    change(changeset, name_at_post_time: name)
+  end
 end

lib/philomena_web/controllers/image/comment_controller.ex

@@ -63,8 +63,9 @@ defmodule PhilomenaWeb.Image.CommentController do
   def create(conn, %{"comment" => comment_params}) do
     attributes = conn.assigns.attributes
     image = conn.assigns.image
+    user = conn.assigns.current_user
 
-    case Comments.create_comment(image, attributes, comment_params) do
+    case Comments.create_comment(image, user, attributes, comment_params) do
       {:ok, %{comment: comment}} ->
         Comments.notify_comment(comment)
         Comments.reindex_comment(comment)