Rails：字段被定义为一个（n）数组，但收到了 ActiveSupport::HashWithIn DifferentAccess

Question

我创建了一个 Post 和一个 TagObject 模型，如下所示

class Post
  include Mongoid::Document
  include Mongoid::Timestamps

  embeds_many :tag_objects

  #embeds_many :comments

  references_one :uploader, :class_name => 'User'
  mount_uploader :image, ImageUploader

  validates_presence_of :image

  attr_accessible :tag_objects, :image
end

class TagObject
  include Mongoid::Document

  field :name
  field :tags, :type => Array

  embedded_in :post, :inverse_of => :tag_objects

  attr_accessible :name, :tags
end

，当前有一个页面将 PUT 提交到 Post 控制器的更新方法。更新失败，我在 WEBrick 控制台中收到以下信息。

Started POST "/posts/4d4a174fa729cf71c70000a8" for 127.0.0.1 at Wed Feb 02 21:52:09 -0500 2011
  Processing by PostsController#update as HTML
  Parameters: {"post"=>{"tag_objects"=>{"1"=>{"tags"=>{"1"=>"testingfds"}}}}, "authenticity_token"=>"OZ+eXzD5NyqUI4CzPadlFUMDwRrg4LsaQBs5i+J65tU=", "id"=>"4d4a174fa729cf71c70000a8"}
honeycomb_development['posts'].find({:_id=>BSON::ObjectId('4d4a174fa729cf71c70000a8')}, {}).limit(-1)
Completed   in 2ms

Mongoid::Errors::InvalidType (Field was defined as a(n) Array, but received a ActiveSupport::HashWithIndifferentAccess with the value {"1"=>"testingfds"}.):
  app/controllers/posts_controller.rb:39:in `update'

我完全不知道如何解决它，任何帮助将不胜感激。

Answer 1

是的，问题似乎在于它正在尝试执行

tags = {0=>'testingdfg'}

而不是

tags[0] = 'testingdfg'

像我预期的那样执行并设置其内容。我只是在更新方法中添加了一些逻辑来执行此操作，并且效果很好。

Answer 2

在模型中，

field :tags, :type => Hash

将

field :tags, :type => Array