我似乎无法一次使用ActiveRecord :: Base.find选项:order多个列。
例如,我有一个带有日期和出席列的“显示”模型。
如果我运行以下代码:
@shows = Show.find(:all, :order => "date")
我得到以下结果:
[#<Show id: 7, date: "2009-04-18", attending: 2>,
#<Show id: 1, date: "2009-04-18", attending: 78>,
#<Show id: 2, date: "2009-04-19", attending: 91>,
#<Show id: 3, date: "2009-04-20", attending: 16>,
#<Show id: 4, date: "2009-04-21", attending: 136>]
如果我运行以下代码:
@shows = Show.find(:all, :order => "attending DESC")
[#<Show id: 4, date: "2009-04-21", attending: 136>,
#<Show id: 2, date: "2009-04-19", attending: 91>,
#<Show id: 1, date: "2009-04-18", attending: 78>,
#<Show id: 3, date: "2009-04-20", attending: 16>,
#<Show id: 7, date: "2009-04-18", attending: 2>]
但是,如果我运行:
@shows = Show.find(:all, :order => "date, attending DESC")
要么
@shows = Show.find(:all, :order => "date, attending ASC")
要么
@shows = Show.find(:all, :order => "date ASC, attending DESC")
我得到的结果与仅按日期排序的结果相同:
[#<Show id: 7, date: "2009-04-18", attending: 2>,
#<Show id: 1, date: "2009-04-18", attending: 78>,
#<Show id: 2, date: "2009-04-19", attending: 91>,
#<Show id: 3, date: "2009-04-20", attending: 16>,
#<Show id: 4, date: "2009-04-21", attending: 136>]
在哪里,我想得到这些结果:
[#<Show id: 1, date: "2009-04-18", attending: 78>,
#<Show id: 7, date: "2009-04-18", attending: 2>,
#<Show id: 2, date: "2009-04-19", attending: 91>,
#<Show id: 3, date: "2009-04-20", attending: 16>,
#<Show id: 4, date: "2009-04-21", attending: 136>]
这是从日志生成的查询:
[4;35;1mUser Load (0.6ms)[0m [0mSELECT * FROM "users" WHERE ("users"."id" = 1) LIMIT 1[0m
[4;36;1mShow Load (3.0ms)[0m [0;1mSELECT * FROM "shows" ORDER BY date ASC, attending DESC[0m
[4;35;1mUser Load (0.6ms)[0m [0mSELECT * FROM "users" WHERE ("users"."id" = 1) [0m
最后,这是我的模型:
create_table "shows", :force => true do |t|
t.string "headliner"
t.string "openers"
t.string "venue"
t.date "date"
t.text "description"
t.datetime "created_at"
t.datetime "updated_at"
t.decimal "price"
t.time "showtime"
t.integer "attending", :default => 0
t.string "time"
end
我想念什么?我究竟做错了什么?
更新:感谢您的所有帮助,但似乎所有人都和我一样受挫。解决问题的实际上是切换数据库。我从默认的sqlite3切换到mysql。