在Rails中如何限制用户在要求升级帐户之前发布保存在数据库中的帖子数

问题描述

我添加了一种控制未订阅用户和已订阅用户的小方法。基本上我的想法是，所有使用Devise进行注册的用户都将获得一个帐户。但是，根据找到的用户ID，我的模型或用户在数据库中可以存储的帖子数量应为25个帖子。我猜下面的方法会起作用；

I'm adding a small way of controlling a non-subscribed user and a subscribed user. Basically my idea is that all users that sign up with the use of Devise, get an account. However, my model or the number of posts a user can have in the database stored based on user ID found should be 25 posts. I'm guessing the following would work;

模型

class Post
  belongs_to :user
  validate :quota, :on => :refresh

  def quota
     Posts = Posts.find(params[:id])
     if user.posts.count >= 25
        flash[:error] = "Sorry you need to upgrade"
     end
  end

end

：refresh是我正在努力的工作，它在其中抓取帖子并将这些帖子添加到数据库内的current_user中，或者将current_user id分配给它添加到数据库中的每个帖子。

:refresh is something I'm working on where it grabs posts and adds these posts to the current_user within the database, or assigns the current_user id to each post it adds to the database.

我在上述功能上正确吗？还是应该将验证计数添加到刷新控制器/模型中；

am I correct on the above function? or should I add the validation count into my refresh controller/model like so;

class dashboard
   def refresh
      ...
      if self.user.posts.count >= 25
         flash[:error] = "You've reached maximum posts you can import"
      end
   end
end

推荐答案

我会使用相应控制器上的before_filter：

I would use a before_filter on the corresponding controller(s):

class PostsController < ApplicationController
  before_filter :check_quota # you could add here: :only => [:index, :new]

  private # optionnal

  def check_quota
    if user.posts.count >= 25
      @quota_warning = "You've reached maximum posts you can import"
    end
  end
end

在视图中：

<% if @quota_warning.present? %>
  <span><%= @quota_warning %></span>
<% end %>

然后在模型上添加验证，以确保约束：

Then add the validation on the model, to ensure the constraint:

class Post < ActiveRecord::Base
  belongs_to :user
  before_save :check_post_quota

  private # optionnal

  def check_post_quota
    if self.user.posts.count >= 25
      self.errors.add(:base, "You've reached maximum posts you can import")
      return false
    end
  end
end

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