在rails4中使用cancan gem时遇到问题

Question

您好我第一次使用康康宝石。我把它包含在我的宝石文件中

gem 'cancancan', '~> 1.10'

然后完成了bundle install并运行命令 rails g cancan：ability ，通过它我生成了我的能力.rb，我已经给出了这段代码

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中给出了这个

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

现在我已登录员工[：role] ='HR'，当我要创建部门时，它会给我错误

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'

请指导我如何解决这个问题。提前谢谢。

Answer 1

您必须覆盖application_controller.rb

中的current_ability方法

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