Mysql Rails 2.3.9-范围、全部删除、全部更新

我有一个叫RaceWeek的模型。我要执行的两个操作：

1我想使用以下条件确定记录的范围：

"start_date <= #{Time.now} AND end_date >= #{Time.now} AND recordable_type != 'User'"

然后我想删除所有这些记录。以下是我现在如何尝试：

RaceWeek.delete_all("start_date <= #{Time.now} AND end_date >= #{Time.now} AND recordable_type != 'User'")

2删除所有记录后，我想重置剩余记录的值。以下是我现在如何尝试做到这一点：

RaceWeek.find(:all, :conditions => ["start_date <= #{Time.now} AND end_date >= #{Time.now}"]).update_all("games_won = 0, games_lost = 0")

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在不讨论我遇到的所有问题的情况下，您能解释一下您通常是如何执行这些类型的操作的吗？

我想我明白您在尝试做什么了。。但我认为有更好的方法可以解决这个问题。我不确定您正在执行的操作的上下文，因此您可以用更合适的名称替换以下命名的\u范围名称，但如果您有类似的名称：

#Your RaceWeek Model
class RaceWeek < ActiveRecord::Base

named_scope :started_before_and_ended_after_today, :conditions => ["start_date <= #{Time.now} AND end_date >= #{Time.now}"]

named_scope :not_recordable_user, :conditions => ["recordable_type != 'User'"]

end

RaceWeek.started_before_and_ended_after_today.not_recordable_user.find(:all)

现在，您可以随时将命名的_范围链接在一起。但是看起来你正在尝试做一些合理重复的事情，所以你不必每次都在每个控制器上写出来，你只需要在你的RaceWeek模型上创建一个类方法就可以了。下面的模型也可以进行更多的折射，但希望这能帮助您开始：

#Your RaceWeek Model
class RaceWeek < ActiveRecord::Base

named_scope :started_before_and_ended_after_today, :conditions => ["start_date <= #{Time.now} AND end_date >= #{Time.now}"]

named_scope :not_recordable_user, :conditions => ["recordable_type != 'User'"]

def self.reset_records
  started_before_and_ended_after_today.not_recordable_user.delete_all   
  started_before_and_ended_after_today.each { |record| record.update_attributes(:games_won => 0, :games_lost => 0)}      
end

end

#Your RaceWeek Model
class RaceWeek < ActiveRecord::Base

named_scope :started_before_and_ended_after_today, :conditions => ["start_date <= #{Time.now} AND end_date >= #{Time.now}"]

named_scope :not_recordable_user, :conditions => ["recordable_type != 'User'"]

def self.reset_records
  started_before_and_ended_after_today.not_recordable_user.delete_all   
  started_before_and_ended_after_today.each { |record| record.update_attributes(:games_won => 0, :games_lost => 0)}      
end

end

RaceWeek.reset_records