Rails：Acts As Votable不允许其他用户投票？

Question

我可以投票，但它不会让新用户投票同样的事情？用户可以投票没有投票的东西，一旦他们投票，其他用户就不会让他们投票。

我已经设置了CanCan，我注意到它给了我同样的错误，好像我无法访问某些东西。所以，我假设它与某些身份验证有关？不让其他用户投票？我的:upvote中有:unvote和before_action是错误的吗？

控制器

class ProjectsController < ApplicationController
  load_and_authorize_resource
  before_action :set_project, only: [:show, :edit, :update, :destroy, :upvote, :unvote]
  before_action :authenticate_user!, only: [:edit, :update, :new, :upvote, :unvote]


  def upvote
    @project.liked_by current_user
    redirect_to :back
  end

  def unvote
    @project.unliked_by current_user
    redirect_to :back
  end

  ... #more codes here...

end

查看

- unless (current_user.voted_for? @project) && (@project.liked_by current_user)
  = link_to like_project_path(@project), method: :put, class: "btn btn-default" do
    %span.glyphicon.glyphicon-heart
      = @project.get_likes.size        
- else 
  = link_to unvote_project_path(@project), method: :put, class: "btn btn-default" do
    %span.glyphicon.glyphicon-heart
      = @project.get_likes.size