def show order = Orderfindparamsidincludesorder_items product_sku product end报错 undefined method includes for #Order0x00005605ed241500

The error is occurring because the includes method is not available on an individual Order object. It is only available on an ActiveRecord::Relation object.

To fix this, you can modify your code to fetch the Order object along with its associated order_items, product_sku, and product using the includes method on the Order model itself.

Here's an updated version of your code:

def show
  @order = Order.includes(order_items: [:product_sku, :product]).find(params[:id])
end

This code will load the Order object with the specified id along with its associated order_items, product_sku, and product in a more efficient way using the includes method