Ruby on rails 如何在rails中仅对一个模型限制act_as_votable gem

我有一个rails应用程序，其中我有两个表post&Reviews，在post中我添加了一个类似的系统，它是从零开始制作的，但是在Reviews中我想使用gem。我添加了gem，一切正常，但由于两个帖子和评论的用户模型相同，帖子上的like系统已停止工作，因此出现以下错误：

NoMethodError (undefined method `vote_by' for nil:NilClass):
  app/models/user.rb:64:in `add_like_to'
  app/controllers/api/likes_controller.rb:11:in `create'

我认为发生这个错误是因为我已经声明用户为投票者，但在不需要的帖子中。 您能告诉我，在我的案例回顾中，是否有任何方法可以在

user.rb

中声明

acts\u as\u voter

user.rb

class User < ActiveRecord::Base
  acts_as_voter
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable,
         :omniauthable, :omniauth_providers => [:facebook, :twitter, :google_oauth2]
  validates :username, presence: true
  validate :avatar_image_size

      has_many :posts, dependent: :destroy
      has_many :quotes, dependent: :destroy
      has_many :responses, dependent: :destroy
      has_many :likes, dependent: :destroy
      has_many :liked_posts, through: :likes, source: :likeable, source_type: "Post"
      has_many :liked_responses, through: :likes, source: :likeable, source_type: "Response"

      has_many :bookmarks, dependent: :destroy
      has_many :bookmarked_posts, through: :bookmarks, source: :bookmarkable, source_type: "Post"
      has_many :bookmarked_responses, through: :bookmarks, source: :bookmarkable, source_type: "Response"

      has_many :notifications, dependent: :destroy, foreign_key: :recipient_id

      after_destroy :clear_notifications
      after_commit :send_welcome_email, on: [:create]

      mount_uploader :avatar, AvatarUploader

      include UserFollowing
      include TagFollowing
      include SearchableUser
      include OmniauthableUser

      extend FriendlyId
      friendly_id :username, use: [ :slugged, :finders ]

      def add_like_to(likeable_obj)
        likes.where(likeable: likeable_obj).first_or_create
      end

      def remove_like_from(likeable_obj)
        likes.where(likeable: likeable_obj).destroy_all
      end

      def liked?(likeable_obj)
        send("liked_#{downcased_class_name(likeable_obj)}_ids").include?(likeable_obj.id)
      end

      def add_bookmark_to(bookmarkable_obj)
        bookmarks.where(bookmarkable: bookmarkable_obj).first_or_create
      end

      def remove_bookmark_from(bookmarkable_obj)
        bookmarks.where(bookmarkable: bookmarkable_obj).destroy_all
      end

      def bookmarked?(bookmarkable_obj)
        send("bookmarked_#{downcased_class_name(bookmarkable_obj)}_ids").include?(bookmarkable_obj.id)
      end

      private

        # Validates the size on an uploaded image.
        def avatar_image_size
          if avatar.size > 5.megabytes
            errors.add(:avatar, "should be less than 5MB")
          end
        end

        # Returns a string of the objects class name downcased.
        def downcased_class_name(obj)
          obj.class.to_s.downcase
        end

        # Clears notifications where deleted user is the actor.
        def clear_notifications
          Notification.where(actor_id: self.id).destroy_all
        end

        def send_welcome_email
          WelcomeEmailJob.perform_later(self.id)
        end
    end

# This controller serves as a parent controller for other likes_controllers. 
# Posts::LikesController for example.
# Child controller that inherit from this LikesController should implement 
# before_action :set_likeable, which sets @likeable.
class API::LikesController < ApplicationController
  before_action :authenticate_user!
  before_action :set_likeable
  skip_before_action :verify_authenticity_token

  def create
    current_user.add_like_to(@likeable)
    notify_author
    render json: { liked: true, count: @likeable.reload.likes.size, type: @likeable.class.to_s, id: @likeable.id }, status: 200
  end

  def destroy
    current_user.remove_like_from(@likeable)

    render json: { liked: false, count: @likeable.reload.likes.size, type: @likeable.class.to_s, id: @likeable.id }, status: 200
  end

  private

    def set_likeable
      raise NotImplementedError, "This #{self.class} cannot respond to 'set_likeable'"
    end

    def notify_author
      unless current_user?(@likeable.user)
        Notification.create(recipient: @likeable.user, actor: current_user, action: "liked your", notifiable: @likeable, is_new: true)
      end
    end
end

class用户[：facebook，：twitter，：google\u oauth2]
验证：用户名，状态：true
验证：化身图像大小
有很多：帖子，依赖：：销毁
有很多：引号，依赖：：销毁
有很多：响应，依赖：：销毁
有很多：喜欢、依赖、破坏
有很多：喜欢的帖子，通过：：喜欢，源：：喜欢，源类型：“帖子”
通过：：likes，source：：likeable，source类型：“Response”
有很多：书签，相依：：销毁
有很多：带书签的帖子，通过：：bookmarks，source：：bookmarkable，source类型：“Post”
有很多：书签式的\u响应，通过：：bookmarks，source：：bookmarkable，source\u类型：“响应”
有多个：通知、依赖：：销毁、外键：：收件人\u id
销毁后：清除通知
提交后：发送欢迎电子邮件，地址：[：创建]
装载上传者：阿凡达，阿凡达上传者
包括用户跟踪
包括以下标记
包括可搜索用户
包括OmniauthableUser
扩展友好ID
友好的\u id:username，使用：[：sluged，：finders]
def添加喜欢的对象到（喜欢的对象）
喜欢。在哪里（可爱的：可爱的对象）。首先创建
结束
def从（可爱的对象）中删除喜欢的对象
喜欢。在哪里（讨人喜欢：讨人喜欢）。毁掉一切
结束
喜欢什么？（讨人喜欢）
发送（“liked#{downcased_class_name（likeable_obj）}u id”）。包括？（likeable_obj.id）
结束
def添加书签到（可书签对象）
书签。在哪里（可书签：可书签的对象）。首先创建
结束
def从（可书签的对象）中删除书签
书签。在哪里（可书签：可书签）。全部销毁
结束
def已书签？（可书签的_obj）
发送（“书签”{downcased_class_name（bookmarkable_obj）}u id”）。包括？（bookmarkable_obj.id）
结束
私有的
#验证上载图像的大小。
def头像图像大小
如果avatar.size>5.MB
错误。添加（：头像，“应小于5MB”）
结束
结束
#返回对象类名称downcased的字符串。
def downcased_类_名称（obj）
obj.class.to_.downcase
结束
#清除已删除用户为参与者的通知。
def清除通知
通知。where（actor\u id:self.id）。销毁所有
结束
def发送欢迎电子邮件
WelcomeEmailJob.稍后执行（self.id）
结束
结束

喜欢控制器.rb

class User < ActiveRecord::Base
  acts_as_voter
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable,
         :omniauthable, :omniauth_providers => [:facebook, :twitter, :google_oauth2]
  validates :username, presence: true
  validate :avatar_image_size

      has_many :posts, dependent: :destroy
      has_many :quotes, dependent: :destroy
      has_many :responses, dependent: :destroy
      has_many :likes, dependent: :destroy
      has_many :liked_posts, through: :likes, source: :likeable, source_type: "Post"
      has_many :liked_responses, through: :likes, source: :likeable, source_type: "Response"

      has_many :bookmarks, dependent: :destroy
      has_many :bookmarked_posts, through: :bookmarks, source: :bookmarkable, source_type: "Post"
      has_many :bookmarked_responses, through: :bookmarks, source: :bookmarkable, source_type: "Response"

      has_many :notifications, dependent: :destroy, foreign_key: :recipient_id

      after_destroy :clear_notifications
      after_commit :send_welcome_email, on: [:create]

      mount_uploader :avatar, AvatarUploader

      include UserFollowing
      include TagFollowing
      include SearchableUser
      include OmniauthableUser

      extend FriendlyId
      friendly_id :username, use: [ :slugged, :finders ]

      def add_like_to(likeable_obj)
        likes.where(likeable: likeable_obj).first_or_create
      end

      def remove_like_from(likeable_obj)
        likes.where(likeable: likeable_obj).destroy_all
      end

      def liked?(likeable_obj)
        send("liked_#{downcased_class_name(likeable_obj)}_ids").include?(likeable_obj.id)
      end

      def add_bookmark_to(bookmarkable_obj)
        bookmarks.where(bookmarkable: bookmarkable_obj).first_or_create
      end

      def remove_bookmark_from(bookmarkable_obj)
        bookmarks.where(bookmarkable: bookmarkable_obj).destroy_all
      end

      def bookmarked?(bookmarkable_obj)
        send("bookmarked_#{downcased_class_name(bookmarkable_obj)}_ids").include?(bookmarkable_obj.id)
      end

      private

        # Validates the size on an uploaded image.
        def avatar_image_size
          if avatar.size > 5.megabytes
            errors.add(:avatar, "should be less than 5MB")
          end
        end

        # Returns a string of the objects class name downcased.
        def downcased_class_name(obj)
          obj.class.to_s.downcase
        end

        # Clears notifications where deleted user is the actor.
        def clear_notifications
          Notification.where(actor_id: self.id).destroy_all
        end

        def send_welcome_email
          WelcomeEmailJob.perform_later(self.id)
        end
    end

# This controller serves as a parent controller for other likes_controllers. 
# Posts::LikesController for example.
# Child controller that inherit from this LikesController should implement 
# before_action :set_likeable, which sets @likeable.
class API::LikesController < ApplicationController
  before_action :authenticate_user!
  before_action :set_likeable
  skip_before_action :verify_authenticity_token

  def create
    current_user.add_like_to(@likeable)
    notify_author
    render json: { liked: true, count: @likeable.reload.likes.size, type: @likeable.class.to_s, id: @likeable.id }, status: 200
  end

  def destroy
    current_user.remove_like_from(@likeable)

    render json: { liked: false, count: @likeable.reload.likes.size, type: @likeable.class.to_s, id: @likeable.id }, status: 200
  end

  private

    def set_likeable
      raise NotImplementedError, "This #{self.class} cannot respond to 'set_likeable'"
    end

    def notify_author
      unless current_user?(@likeable.user)
        Notification.create(recipient: @likeable.user, actor: current_user, action: "liked your", notifiable: @likeable, is_new: true)
      end
    end
end

#此控制器用作其他类似控制器的父控制器。
#Posts：：例如LikesController。
#继承自此LikeController的子控制器应实现
#before_action:set_likeable，设置@likeable。
类API:：LikeController

在您的

用户

模型中没有调用

投票人

，因此我不确定如何将错误消息粘贴到您的问题中

无论如何，您可能应该在控制器中实现

set\u likable

方法，以便将

@likable

实例变量作为参数传递给

当前用户。将\u like\u添加到（@likable）

已设置

---

我认为这应该可以解决您当前的问题。

错误是告诉您正在对

user.rb

第64行中的nil对象调用

vote\u by

。你能给我们看看你的用户类吗？@FrançoisKoessler现在请看一下，我已经用用户更新了问题。rb@Thatdude错误发生在controller

app/controllers/api/likes\u controlle

中，因此您需要发布控制器代码。@MoamenNaanou在我从user.rb中删除acts\u as\u votable时做了检查。它工作正常，但我使用acts\u as\u votable获得的第二个类似系统无法工作