在Rails中使用cancan gem时遇到的问题

Question

嗨，我是第一次使用康康宝石。 我已将此包含在我的gem文件中

gem 'cancancan', '~> 1.10'

然后完成捆绑安装并运行命令轨g cancan：ability，通过该能力生成我的ability.rb，并在其中给出了此代码

class Ability
  include CanCan::Ability

  def initialize(employee)
    employee ||= Employee.new
    if employee[:role]== 'HR'
      can :manage, :all
    else
      can :read, :all
    end
  end
end

并在我的application_Controller给定

rescue_from CanCan::AccessDenied do |exception|
    flash[:error] = "Access denied."
    redirect_to root_url
 end

现在我已经用employee [：role] ='HR'登录，当我要创建部门时，它给了我错误

NameError (undefined local variable or method `current_user' for #<DepartmentsController:0xb48a0c0>):
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_additions.rb:357:in `current_ability'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:215:in `current_ability'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:98:in `initial_attributes'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:91:in `assign_attributes'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:86:in `build_resource'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:66:in `load_resource_instance'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:32:in `load_resource'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:25:in `load_and_authorize_resource'
  vendor/ruby/2.1.0/gems/cancancan-1.10.1/lib/cancan/controller_resource.rb:10:in `block in add_before_filter'

请指导我如何解决此问题。 提前致谢。

Answer 1

您必须在application_controller.rb中覆盖current_ability方法

def current_ability
   @current_ability ||= Ability.new(your_current_logged_in_employer_object)
end