rails中Virtus的默认值

Question

我使用virtus(1.0.5)和rails (5.0.2)。我使用Virtus作为一个模型，因为它具有基于所访问的页面的验证。

我的组织模式是

class Organization < ApplicationRecord
  validates :name, presence: true
end

使用virtus创建的表单如下

class OrganizationProfileForm
  include ActiveModel::Model
  include Virtus.model

  attribute :call_center_number, String, default: :org_call_center_number

  validates :call_center_number, presence: true

  def initialize(organization)
    @organization = organization
  end

  private

  def org_call_center_number
    @organization.call_center_number
  end

end

不幸的是，上面的代码不能工作

Loading development environment (Rails 5.0.2)
2.3.0 :001 > of = OrganizationProfileForm.new(Organization.last)
Organization Load (0.6ms)  SELECT  "organizations".* FROM "organizations" ORDER BY "organizations"."id" DESC LIMIT $1  [["LIMIT", 1]]
=> #<OrganizationProfileForm:0x007f9d61edd6a8 @organization=# <Organization id: 1, name: "Some name", call_center_number: "4892374928", created_at: "2017-03-29 09:35:22", updated_at: "2017-03-29 09:37:59">>
2.3.0 :002 > of.call_center_number
=> nil

Answer 1

我们需要在初始化方法中调用super()。

Answer 2

尝试删除行private，因为这可能会阻止对方法org_call_center_number的调用。为维塔斯上的默认值提供的示例使用的是公共实例方法，而不是私有实例方法。

请参阅：“私人”、“公共”和“受保护的方法”有什么区别？