#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'
 

backend/db/migrate/20260323192300_create_wiki_assets.rb

@@ -1,6 +1,6 @@
 class CreateWikiAssets < ActiveRecord::Migration[8.0]
   def change
-    create_table :wiki_assets, primary_key: [:wiki_page_id, :no] do |t|
+    create_table :wiki_assets do |t|
       t.references :wiki_page, null: false, foreign_key: true, index: false
       t.integer :no, null: false
       t.string :alt_text
@@ -10,6 +10,7 @@ class CreateWikiAssets < ActiveRecord::Migration[8.0]
     end
 
     add_index :wiki_assets, [:wiki_page_id, :sha256], unique: true
+    add_index :wiki_assets, [:wiki_page_id, :no], unique: true
 
     add_column :wiki_pages, :next_asset_no, :integer, null: false, default: 1
   end

backend/db/schema.rb

@@ -239,7 +239,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_03_23_192300) do
     t.datetime "updated_at", null: false
   end
 
-  create_table "wiki_assets", primary_key: ["wiki_page_id", "no"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+  create_table "wiki_assets", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "wiki_page_id", null: false
     t.integer "no", null: false
     t.string "alt_text"
@@ -248,6 +248,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_03_23_192300) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["created_by_user_id"], name: "index_wiki_assets_on_created_by_user_id"
+    t.index ["wiki_page_id", "no"], name: "index_wiki_assets_on_wiki_page_id_and_no", unique: true
     t.index ["wiki_page_id", "sha256"], name: "index_wiki_assets_on_wiki_page_id_and_sha256", unique: true
   end