如何使用Pundit允许的属性自动删除Active Admin表单输入？

Question

我有一个Rails 4应用程序使用Active Admin 1.0.0.pre1和pundit 0.3.0进行授权,到目前为止一直运行良好,但我很难找到一个好的方法根据用户的角色自动定制表单.

鉴于这些模型:

ActiveAdmin.register AdminUser do
  permit_params do
    Pundit.policy(current_admin_user, resource).permitted_attributes
  end

  form do |f|
    f.inputs "Admin Details" do
      f.input :role, as: :select, collection: [:manager, :admin]
      f.input :email, as: :email
      f.input :password
      f.input :password_confirmation
    end
    f.actions
  end
end

class AdminUserPolicy < ApplicationPolicy
  def permitted_attributes
    attributes = [:email, :password, :password_confirmation]
    attributes += [:role] if user.has_role? :super_admin
    attributes
  end
end

我想将role输入从表单中自动删除.

一种选择可能是:

  permitted_attributes = Pundit.policy(current_admin_user, resource).permitted_attributes

  form do |f|
    f.inputs "Admin Details" do
      f.input :role if permitted_attributes.include? :role
      f.input :email
      f.input :password
      f.input :password_confirmation
    end
    f.actions
  end

但是,这种方法要求开发人员记住应该检查哪些属性,似乎容易遗忘,并且不完全是DRY.也许,我这是错误的方式？欢迎所有建议.

Answer 1

通过在前面添加一个模块来拦截 ActiveAdminForm，该模块input通过检查 Pundit 策略进行覆盖，似乎效果很好。这是我的实现：

# /lib/active_admin/permitted_active_admin_form.rb
module PermittedActiveAdminForm
  def permitted_attributes
    policy = Pundit.policy(current_admin_user, resource)
    policy.respond_to?(:permitted_attributes) ? policy.permitted_attributes : []
  end

  def input(*args)
    super(*args) if permitted_attributes.include? args[0]
  end
end


# /config/initializers/active_admin.rb
module ActiveAdmin
  module Views
    class ActiveAdminForm < FormtasticProxy
      prepend PermittedActiveAdminForm
    end
  end
end

# /app/admin/admin_user.rb
ActiveAdmin.register AdminUser do
  permit_params do
    resource ||= AdminUser
    Pundit.policy(current_admin_user, resource).permitted_attributes
  end

  form do |f|
    f.inputs "Admin Details" do
      f.input :role, as: :select, collection: [:manager, :admin]
      f.input :email, as: :email
      f.input :password
      f.input :password_confirmation
    end
    f.actions
  end
end

感谢 Andrey Deineko 让我走上了正确的道路。