#47

backend/app/controllers/wiki_assets_controller.rb

@@ -21,6 +21,7 @@ class WikiAssetsController < ApplicationController
     file = params[:file]
     return head :bad_request if file.blank?
 
+    asset = nil
     page.with_lock do
       no = page.next_asset_no
       alt_text = params[:alt_text].presence
@@ -33,6 +34,6 @@ class WikiAssetsController < ApplicationController
       page.update!(next_asset_no: no + 1)
     end
 
-    render json: asset.as_json(methods: [:url])
+    render json: asset.as_json(only: [:wiki_page_id, :no], methods: [:url])
   end
 end

backend/app/models/wiki_asset.rb

@@ -1,6 +1,4 @@
 class WikiAsset < ApplicationRecord
-  self.primary_key = :wiki_page_id, :no
-
   belongs_to :wiki_page
   belongs_to :created_by_user, class_name: 'User'