Question

我正在尝试生成一个随机4-5字母数字字符串来替换标准用户ID，我有一切正常工作，除了每次刷新它生成的页面并替换字符串。我已经尝试过before_save和before_create，但两者似乎都不起作用。

我的模特：

class Admin < ActiveRecord::Base
  before_create :admin_ident

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable,
         :validatable, :confirmable, :lockable, :timeoutable

       validates_uniqueness_of :admin_ident

       def admin_ident
         self.admin_ident = SecureRandom.hex(2).upcase
       end
end

我的设计注册控制器：

class Admin::Admins::RegistrationsController < Devise::RegistrationsController

  private

  def sign_up_params
    params.require(:admin_admin).permit(:email, :password, :password_confirm, :admin_ident, :f_name, :m_name, :l_name, :dob, :street_number, :street_name, :unit_apt,
    :quadrant, :city, :province, :postal_code, :home_tel, :moibile_tel, :office_tel, :office_ext, :company_email,
    :position, :start_date, :end_date, :quit, :resigned, :terminated_cause, :terminated_wo_cause, :medical_leave,
    :leave_of_abscense, :dl_number, :dl_class, :expiry, :conditions, :sl_number, :sl_certs, :issued, :expires, :emc_1_name,
    :emc_1_tel, :emc_1_relationship, :emc_2_name, :emc_2_tel, :emc_2_relationship)
  end

  def account_update_params
    params.require(:admin_admin).permit(:email, :password, :password_confirm, :current_password, :admin_ident, :f_name, :m_name, :l_name, :dob, :street_number, :street_name, :unit_apt,
    :quadrant, :city, :province, :postal_code, :home_tel, :moibile_tel, :office_tel, :office_ext, :company_email,
    :position, :start_date, :end_date, :quit, :resigned, :terminated_cause, :terminated_wo_cause, :medical_leave,
    :leave_of_abscense, :dl_number, :dl_class, :expiry, :conditions, :sl_number, :sl_certs, :issued, :expires, :emc_1_name,
    :emc_1_tel, :emc_1_relationship, :emc_2_name, :emc_2_tel, :emc_2_relationship)
  end

  def set_admin
     @admin = Admin.find_by_admin_ident(params[:id])
  end

end

My Routes.rb文件：

  ## Namespace Resources
    namespace :admin do
      devise_for :admins, controllers: {
        :registrations => 'admin/admins/registrations',
        :sessions => 'admin/admins/sessions',
        :passwords => 'admin/admins/passwords',
        :confirmations => 'admin/admins/confirmations',
        :unlocks => 'admin/admins/unlocks'
      }
      resources :admin_static
    end

  ## Devise Scopes
  devise_scope :admin do
    authenticated  do
      root to: 'admin/admin_static#home', as: 'admin_authenticated_root'
    end
  end

不确定我在哪里出错...任何帮助都会很棒！

修改1：

我正在尝试编辑admin / admin_static＃主页

Answer 1

据推测，您正在使用admin_ident在这些网页上展示some_admin.admin_ident。

这将更新属性，因为您已将reader方法替换为设置admin ident的方法。我建议您调用该方法set_admin_ident（并更新before_create以匹配）

Answer 2

我认为你可能会使用相同的名称来进行字段和随机更新字段的方法。

before_create :generate_admin_ident
validates_uniqueness_of :generate_admin_ident

def generate_admin_ident
  begin
    self.admin_ident = SecureRandom.hex(2).upcase
    other_admin = Admin.find_by(admin_ident: self.admin_ident)
  end while other_admin
end

这应该使admin_ident的所有用法都引用该字段而不是随机生成器。

请注意，您还使用验证来确保唯一性，但这会导致create!或save的任意调用失败。这些应该包含在begin..rescue..retry块中，或者随机生成器应该自己验证唯一性。

begin..end while循环和other_admin代码旨在手动验证方法生成的admin_ident的唯一性，并继续尝试，直到找到唯一值。

生成一个随机字符串以保存为id，但每次刷新时都会继续更改？

2 个答案: