Question

我试图限制我的应用程序的用户投票（在这种情况下喜欢）一个特定次数的问题的答案。我成功停止了user_id的收集，但记录不断创建。我需要验证来实际阻止在likes表中创建记录。

alt text http://gadocidesign.squarespace.com/storage/Screen%20shot%202010-05-20%20at%2010.07.19%20AM.png

正如您所看到的，最后两张选票失去了user_id但仍然创建了。下面的代码将向您展示我是如何做到这一点的。我试图限制用户在问题的任何答案上投票不超过10次。

和模型一样（我省略了反向的has_many关联，但它们就在那里）。

class Like < ActiveRecord::Base
  belongs_to :site
  belongs_to :user
  belongs_to :question


    validates_each :user_id do |row, attr, value|
      m.errors.add :user_id, 'Too many likes' unless row.like_count < 10
    end

    def like_count
      Like.count(:conditions => {:user_id => user_id, :question_id => question_id})
    end
  end

LikesController＃创建

class LikesController < ApplicationController

  def create
    @user = current_user
    @site = Site.find(params[:site_id])
    @like = @site.likes.create!(params[:like])
    @like.user = current_user
    @like.save

    respond_to do |format|
     format.html { redirect_to @site}
     format.js
     end
  end
end

Answer 1

你告诉它要完全按照你所看到的去做。

# This is what creates the record you're seeing in your db.
@like = @site.likes.create!(params[:like])

# And now you try to assign the user.
@like.user = current_user
@like.save

尝试这样的事情：

@like = @site.likes.create!(params[:like].merge(:user_id => @user.id))

validates_each user_id＆amp; question_id停止收集user_id但不停止创建记录

1 个答案: