Ruby on rails 3 验证嵌套属性

为什么不调用

资源分配中的验证

class Employee < ActiveRecord::Base 
         has_many :resource_allocations
         accepts_nested_attributes_for :resource_allocations
         validates_associated :resource_allocations
    end


class ResourceAllocation < ActiveRecord::Base
  belongs_to :employee

  validate :location_id, :presence => true
  validate :department_id, :presence => true
  validate :period_from, :presence => true
  validate :period_to, :presence => true
  validate :allocation, :presence => true, :numericality => true
end

class Employeetrue
验证：部门id，：状态=>true
验证：期间\从，：存在=>true
验证：周期_到，：存在=>true
验证：分配，：存在=>true，：数值=>true
终止