Added Search function for items and fixed javascript controller

app/controllers/categories_controller.rb

@@ -9,7 +9,17 @@ class CategoriesController < ApplicationController
   # GET /categories/1 or /categories/1.json
   def show
     @category = Category.find(params[:id])
-    @items = @category.items.includes(:user, :room).order(:name)
+
+    # Basis-Abfrage: Alle Items dieser Kategorie laden
+    @items = @category.items.includes(:user, :room).order(created_at: :desc)
+
+    if params[:query].present?
+      query_str = "%#{params[:query]}%"
+      @items = @items.where(
+        "items.name LIKE :q OR items.sku LIKE :q OR items.serial_number LIKE :q OR items.sticker_id LIKE :q",
+        q: query_str
+      )
+    end
   end
 
   # GET /categories/new