Ruby on rails Rails连接重复默认的\u范围

经过进一步的调查，这个错误似乎是rails 4.0.x中的一个bug导致默认的_范围被调用了两次。我在github上发布了这个问题：

拉里·里德（Larry Reid）在这个问题上的出色帮助值得称赞

class Property < ActiveRecord::Base
  has_many :units

  def self.default_scope
    where('active_at <= :now AND inactive_at > :now', now: Time.zone.now)
  end
end

class Unit < ActiveRecord::Base
  belongs_to :property

  def self.with_active_properties
   joins(:property)
  end
end

SELECT "units".* FROM "units" INNER JOIN "properties" ON "properties"."id" = "units"."property_id" AND (active_at <= '2014-03-11 03:36:13.994068' AND inactive_at > '2014-03-11 03:36:13.994068') AND (active_at <= '2014-03-11 03:36:13.967550' AND inactive_at > '2014-03-11 03:36:13.967550')