copy comments when images are merged

lib/philomena/comments.ex

@@ -162,6 +162,14 @@ defmodule Philomena.Comments do
     |> Repo.update()
   end
 
+  def migrate_comments(image, duplicate_of_image) do
+    Comment
+    |> where(image_id: ^image.id)
+    |> Repo.update_all(set: [image_id: duplicate_of_image.id])
+
+    reindex_comments(duplicate_of_image)
+  end
+
   @doc """
   Returns an `%Ecto.Changeset{}` for tracking comment changes.
 
@@ -187,6 +195,17 @@ defmodule Philomena.Comments do
     comment
   end
 
+  def reindex_comments(image) do
+    spawn fn ->
+      Comment
+      |> preload(^indexing_preloads())
+      |> where(image_id: ^image.id)
+      |> Comment.reindex()
+    end
+
+    image
+  end
+
   def indexing_preloads do
     [:user, image: :tags]
   end

lib/philomena/images.ex

@@ -20,6 +20,7 @@ defmodule Philomena.Images do
   alias Philomena.Notifications
   alias Philomena.Interactions
   alias Philomena.Reports.Report
+  alias Philomena.Comments
 
   @doc """
   Gets a single image.
@@ -321,6 +322,7 @@ defmodule Philomena.Images do
     case result do
       {:ok, changes} ->
         tags = Tags.copy_tags(image, duplicate_of_image)
+        Comments.migrate_comments(image, duplicate_of_image)
         Interactions.migrate_interactions(image, duplicate_of_image)
 
         {:ok, %{changes | tags: changes.tags ++ tags}}

lib/philomena_web/controllers/image/tag_controller.ex

@@ -3,6 +3,7 @@ defmodule PhilomenaWeb.Image.TagController do
 
   alias Philomena.TagChanges.TagChange
   alias Philomena.UserStatistics
+  alias Philomena.Comments
   alias Philomena.Images.Image
   alias Philomena.Images
   alias Philomena.Tags
@@ -21,6 +22,7 @@ defmodule PhilomenaWeb.Image.TagController do
 
     case Images.update_tags(image, attributes, image_params) do
       {:ok, %{image: {image, added_tags, removed_tags}}} ->
+        Comments.reindex_comments(image)
         Images.reindex_image(image)
         Tags.reindex_tags(added_tags ++ removed_tags)