为什么在Rails3.2.9中未调用validate函数？

Question

The codes are as follows:

class Seat < ActiveRecord::Base
  attr_accessible :baggage, :flight_id, :name
  def validate(record)
    errors.add_to_base("You have too much baggage")
  end
end

I expected it throws error whenever a new record is wriiten into the database.

However, nothing happened when new record wriiten into seats database by @seat.save

Does anyone have ideas about this?

Answer 1

validate(record) looks weird. You should try

class Seat < ActiveRecord::Base
  attr_accessible :baggage, :flight_id, :name
  validate :valid_baggage

  def valid_baggage
    errors.add_to_base("You have too much baggage")
  end
end

Also note that you need to call @seat.save! (instead of @seat.save ) in order to get the exception. @seat.save will return true or false only ... but that's usually what you want, so consider if you really want to raise an exception.

Answer 2

仅当您实现自定义验证器时才需要record参数，否则该方法已经知道要验证的记录（自身）。