Question

我正在尝试对用户在白天对特定帖子进行评论的数量设置限制。我在Post模型中实现了以下（成功）以限制他们可以创建的帖子数量。

class Post < ActiveRecord::Base 
  validate :daily_limit, :on => :create
  def daily_limit
      # Small limit for users who just sign up
      if author.created_at >= 14.days.ago
        if author.created_posts.today.count >= 4
           errors.add(:base, "Exceeds Your Daily Trial Period Limit(4)")
        end
      else
        if author.created_posts.today.count >= author.post_limit_day
           errors.add(:base, "Exceeds Your Daily Limit")
      end
    end
  end
end

但是，当我尝试在我的评论模型中添加类似的限制时

class PostComment < ActiveRecord::Base
  validate :daily_limit, :on => :create
  belongs_to :post, :counter_cache => true
  belongs_to :user

  def daily_limit
      # Small limit for users who just sign up
      if user.posted_comments.today.count >= 2
        errors.add(:base, "Exceeds Your Daily Trial Period Limit(4)")
      end 
  end
end

我遇到了undefined method 'posted_comments' for nil:NilClass错误。我不相信我的user_id正确传递到我的模型中，以便使用user.posted_comments.today.count>=2

之类的方式访问它

我在post_comments控制器中的创建操作如下：

class PostCommentsController < ApplicationController
  def create
    @post = Post.find(params[:post_id])
    @post_comment = @post.post_comments.create(post_comment_params)
    @post_comment.user = current_user
    if @post_comment.save
      redirect_to @post
    else 
      flash[:alert] = "Comment Not Added"
      redirect_to @post
    end
  end
end

和我被黑的用户模型如下：

class User < ActiveRecord::Base
  has_many :created_posts, class_name: 'Post', :foreign_key => "author_id",   
  dependent: :destroy

  has_many :posted_comments, class_name: 'PostComment', :foreign_key =>"user_id", dependent: :destroy 
end

感谢。

Answer 1

您在＆＃34;创建＆＃34;之后分配用户在你的控制器

@post_comment = @post.post_comments.create(post_comment_params)  
@post_comment.user = current_user

试试这个：

@post_comment = @post.post_comments.build(post_comment_params)
@post_comment.user = current_user

从Rails中的Post-Comment模型传入，检索和设置User的限制

1 个答案: