范围提高 MysQL 错误:排序规则的非法混合



>很奇怪:我有一个范围运行良好:

scope :starting_at, lambda {|start_date|
    where("CAST(starts_at AS TIME) = ?", Event.db_time(start_date))
}
(rdb:1) sd1 => 2012-12-16 10:00:00 +0100
Event.starting_at(sd1)
[#<Event id: 1, account_id: 1, place_id: 1, slug: "my-new-....

我还有另一个类似的范围,它引发了一个错误:

scope :starting_at_between, lambda {|start_time, end_time|
    where( "? <= CAST(starts_at AS TIME) <= ?", Event.db_time(start_time), Event.db_time(end_time) )
}
(rdb:1) sd2  =>  2012-12-15 08:00:00 +0100
(rdb:1) ed2  =>  2012-12-19 23:00:00 +0100
Event.starting_at_between(ed2, sd2)
INTERNAL ERROR!!! Mysql2::Error: Illegal mix of collations (utf8_general_ci,COERCIBLE) and (latin1_swedish_ci,NUMERIC) for operation '<=': SELECT `events`.* FROM `events`  WHERE ('23:00:00' <= CAST(starts_at AS TIME) <= '08:00:00')

使用这个有什么问题...?不是因为 2 个参数.我有一个类似的范围,其中 CAST 是 AS DATE 并且运行良好......

scope :starting_on_between, lambda { |start_date, end_date|
    where( "? <= CAST(starts_at AS DATE) <= ?", Event.db_date(start_date), Event.db_date(end_date) )
}
Event.starting_on_between(ed2, sd2)
[#<Event id: 1, account_id: 1, place_id: 1, slug:...

错误的演员表 .. 应该在过滤器值上完成...不在数据库记录属性上..

范围 :starting_at_between, lambda {|start_time, end_time| 其中( "CAST( ?作为时间) <= starts_at <= CAST( ?AS TIME)", Event.db_time(start_time), Event.db_time(end_time) ) }

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