Mongoid查询为一个文件内关于阵列的内容

Question

我想如果检索与Mongoid和Rails用户之间创建连接的一些信息存在，这里是代码：

class ContactController < ApplicationController 
    def addNew 
    @newFriend = params[:username] 
    puts "***value of @newFriend***" 
    puts @newFriend 
    puts "***end****" 
    Contact.where(owner: current_user).where(friendlist: params[:username]) do |contact| 
     puts "***value of @contactAlreadyExists***" 
     puts contact 
     puts "***end****" 
     if contact == nil 
     Contact.find_or_create_by(owner: current_user) do |contact| 
      contact.push(friendlist: params[:username]) 
     end 
     end 
    end 
    redirect_to "/" 
    end 
end 

控制台不显示来自

puts "***value of @contactAlreadyExists***" 
     puts contact 
     puts "***end****" 

Answer 1

什么这是一个暂时的解决方案事业前再次上线添加某人无法查询内部发生

user.contacts.find_or_create_by(owner: user.id) do |contact| 

代码：

class ContactController < ApplicationController 
     def addNew 
     @newFriend = params[:username] 
     puts "***value of @newFriend***" 
     puts @newFriend 
     puts "***end****" 
     User.find_by(username: current_user.username) do |user| 
      puts "*** here enters***" 
      user.contacts.find_or_create_by(owner: user.id) do |contact| 
      User.find_by(username: params[:username]) do |friend| 
       puts "***enter on friend" 
       puts friend 
       contact.push(friendlist: friend.id) 
      end 
      puts "***contact***" 
      puts contact 
      puts "***end****" 
      end 
     end 
     redirect_to "/" 
     end 
    end