試圖顯示包含帖子的類別列表。聽起來很簡單，但我有點卡住了。 這個 ActiveRecord find all parents that have associated children class Category < ActiveRecord::Base
has_many :posts
end
class Post < ActiveRecord::Base
belong
我讀過以下網頁： python decimals - rounding to nearest whole dollar (no cents) - with ROUND_HALF_UP http://docs.python.org/library/decimal.html 我有以下代碼： total_num = Decimal(str(total/10))
total_num.quantize(D
當我調試我Windows窗體應用程序我得到這個錯誤： Retrieving the COM class factory for component with CLSID {27526253-6119-4B38-A1F9-2DC877E72334} failed due to the following error: 80040154 Class not registered (Exception