Rails 3 自定义验证

Question

我正在尝试创建一个自定义验证，以验证时间表的 start_date 和 end_date 不与另一个时间表重叠

class Schedule < ActiveRecord::Base
#has many scheduleTimes (fk in scheduleTime)
has_many :scheduletimes, :inverse_of => :schedule 

validate :dateOverlaps?

scope :active, lambda {
 where('? between start_date and end_date', Date.today)
}
def dateOverlaps?
  results = ActiveRecord::Base.connection.execute("Select (start_date::DATE, end_date::DATE) OVERLAPS ('#{self.start_date}'::DATE, '#{self.end_date}'::DATE) from schedules;")
  errors.add_to_base("Date ranges cannot overlap with another schedule") if                   results.first["overlaps"] == 't'
end

但是，这会导致

NoMethodError: undefined method `add_to_base' 

我尝试创建自定义验证器并使用私有验证方法无济于事。有人可以帮我解释一下吗？

Answer 1

尝试替换这个：

errors.add_to_base("Date ranges cannot overlap with another schedule")

用这个：

errors.add(:base, "Date ranges cannot overlap with another schedule")

Answer 2

代替：

errors.add_to_base

尝试使用：

errors.add