将属性传递给Mongoid update_attributes()

Question

我想从mongoid中使用这个函数:

person.update_attributes(first_name: "Jean", last_name: "Zorg")

但我想从另一个变量传递所有属性.我怎么做？

编辑:谢谢大家的回复.我是红宝石的新手,所以起初我以为我犯了一个愚蠢的错误.错误是在一个完全不同的地方,正确的代码,为您的乐趣:

  def twitter
    # Scenarios:
    # 1. Player is already signed in with his fb account:
    #    we link the accounts and update the information.
    # 2. Player is new: we create the account.
    # 3. Player is old: we update the player's information.
    # login with a safe write.
    puts "twitter"
    twitter_details = {
      twitter_name: env["omniauth.auth"]['user_info']['name'], 
      twitter_nick: env["omniauth.auth"]['user_info']['nickname'],
      twitter_uid: env["omniauth.auth"]['uid']
    }
    if player_signed_in?
      @player = Player.find(current_player['_id']) 
    else
      @player = Player.first(conditions: {twitter_uid: env['omniauth.auth']['uid']})
    end

    if @player.nil?
      @player = Player.create!(twitter_details)
    else
      @player.update_attributes(twitter_details)
    end

    flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Twitter"
    sign_in_and_redirect @player, :event => :authentication
  end

Answer 1

该update_attributes方法采用Hash参数,因此如果你有一个哈希,h只需:first_name和:last_name键然后:

person.update_attributes(h)

如果你的Hash有更多的键,那么你可以slice用来拉出你想要的键:

person.update_attributes(h.slice(:first_name, :last_name))

Answer 2

如果你看一下Mongoid的源代码,你会看到update_attributes文件中 的定义.rvm/gems/ruby-1.9.2-p0/gems/mongoid-2.3.1/lib/mongoid/persistence.rb

# Update the document attributes in the datbase.                                                                                                         
#                                                                                                                                                        
# @example Update the document's attributes                                                                                                              
#   document.update_attributes(:title => "Sir")                                                                                                          
#                                                                                                                                                        
# @param [ Hash ] attributes The attributes to update.                                                                                                   
#                                                                                                                                                        
# @return [ true, false ] True if validation passed, false if not.                                                                                       
def update_attributes(attributes = {})
  write_attributes(attributes); save
end

它需要一个哈希 - 这意味着你可以使用哈希作为传入的变量.例如

my_attrs = {first_name: "Jean", last_name: "Zorg"}

person.update_attributes( my_attrs )