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-rw-r--r--app/helpers/routing_helper.rb5
-rw-r--r--app/serializers/rest/instance_serializer.rb2
2 files changed, 6 insertions, 1 deletions
diff --git a/app/helpers/routing_helper.rb b/app/helpers/routing_helper.rb
index 11894a895..998b7566f 100644
--- a/app/helpers/routing_helper.rb
+++ b/app/helpers/routing_helper.rb
@@ -4,6 +4,7 @@ module RoutingHelper
   extend ActiveSupport::Concern
   include Rails.application.routes.url_helpers
   include ActionView::Helpers::AssetTagHelper
+  include Webpacker::Helper
 
   included do
     def default_url_options
@@ -17,6 +18,10 @@ module RoutingHelper
     URI.join(root_url, source).to_s
   end
 
+  def full_pack_url(source, **options)
+    full_asset_url(asset_pack_path(source, options))
+  end
+
   private
 
   def use_storage?
diff --git a/app/serializers/rest/instance_serializer.rb b/app/serializers/rest/instance_serializer.rb
index 2898011fd..ae1dbe6b5 100644
--- a/app/serializers/rest/instance_serializer.rb
+++ b/app/serializers/rest/instance_serializer.rb
@@ -27,7 +27,7 @@ class REST::InstanceSerializer < ActiveModel::Serializer
   end
 
   def thumbnail
-    full_asset_url(instance_presenter.thumbnail.file.url) if instance_presenter.thumbnail
+    instance_presenter.thumbnail ? full_asset_url(instance_presenter.thumbnail.file.url) : full_pack_url('preview.jpg')
   end
 
   def stats