Rails 无法使用 update_attrib 持久化孙项嵌套属性

Question

我正在开发一个回形针上传系统，其中我有一个用户，他有许多上传，而这些上传又有许多Upload_Images关系。

由于我的系统工作方式的性质，用户创建一次，然后在将来添加上传，并且需要在用户控制器更新操作中创建上传记录。 最初只是需要创建的上传记录，但我必须扩展功能以包含Upload_image。目前，将创建上传记录，但不创建upload_image。

他是发送新上传表单(带有上传图像(后调用 Update 方法的参数哈希。

"_method"=>"put",
 "authenticity_token"=>"fEDOZfJ6UarMD/nNM7t86zYXrEkTFtXyrXKJglYZ0Jw=",
 "user"=>{"uploads_attributes"=>{"0"=>{"id"=>"37"},
 "1"=>{"id"=>"36"},
 "2"=>{"id"=>"35"},
 "3"=>{"id"=>"34"},
 "4"=>{"id"=>"33"},
 "5"=>{"id"=>"32"},
 "6"=>{"id"=>"31"},
 "7"=>{"id"=>"30"},
 "8"=>{"id"=>"29"},
 "9"=>{"id"=>"28"},
 "10"=>{"id"=>"27"},
 "11"=>{"id"=>"26"},
 "12"=>{"id"=>"25"},
 "13"=>{"id"=>"24"},
 "14"=>{"id"=>"23"},
 "15"=>{"id"=>"22"},
 "16"=>{"id"=>"21"},
 "17"=>{"id"=>"20"},
 "18"=>{"id"=>"19"},
 "19"=>{"id"=>"18"},
 "20"=>{"id"=>"17"},
 "21"=>{"id"=>"16"},
 "22"=>{"id"=>"15"},
 "23"=>{"id"=>"14"},
 "24"=>{"id"=>"13"},
 "25"=>{"id"=>"12"},
 "26"=>{"id"=>"11"},
 "27"=>{"id"=>"10"},
 "28"=>{"upload"=>#<ActionDispatch::Http::UploadedFile:0x00000004103d18 @original_filename="robot.rres",
 @content_type="application/octet-stream",
 @headers="Content-Disposition: form-data; name="user[uploads_attributes][28][upload]"; filename="robot.rres"rnContent-Type: application/octet-streamrn",
 @tempfile=#<File:/tmp/RackMultipart20120505-2595-lmr2j4>>,
 "name"=>"Test",
 "file_description"=>"Test",
 "private"=>"0",
 "file_category"=>"1",
 "upload_images_attributes"=>{"0"=>{"upload_image"=>#<ActionDispatch::Http::UploadedFile:0x00000004103a98 @original_filename="Low_Res_NAO_NextGen_04.png",
 @content_type="image/png",
 @headers="Content-Disposition: form-data; name="user[uploads_attributes][28][upload_images_attributes][0][upload_image]"; filename="Low_Res_NAO_NextGen_04.png"rnContent-Type: image/pngrn",
 @tempfile=#<File:/tmp/RackMultipart20120505-2595-16gf0jl>>,
 "preview"=>"0"}}}},
 "username"=>"chunter"},
 "commit"=>"Submit Upload",
 "id"=>"chunter"}

如您所见，上传文件和Upload_Image文件的参数都已发送，但仅上传将保存到数据库中。

我的更新方法：

  def update
    @user = User.find_by_username(params[:id])
    #Update the users uploadS
    unless @user.update_attributes(params[:user])
      session[:error] = @user.errors.full_messages
      #render :action => "show"
      respond_to do |format|
        format.html { redirect_to :back, notice: 'Update unsuccessful.' }
        format.json { head :ok }
      end
    else
      respond_to do |format|
        format.html { redirect_to :back, notice: 'Update successful.' }
        format.json { head :ok }
      end
    end    
  end

这是我的模型(为了可读性，我删除了额外的东西(：

用户

class User < ActiveRecord::Base
  attr_accessible :email, :password, :password_confirmation, :remember_me, :admin, :username, :avatar, :description, :name, :country, :province, :gender, :occupation, :city, :address, :birth_date, :uploads_attributes, :avatar_attachment_size, :avatar_file_type, :banned_until, :upload_images_attributes
  has_many :posts, :dependent => :destroy, :order => 'created_at desc'
  has_many :topics, :dependent => :destroy, :order => 'created_at desc'
  has_many :viewings, :dependent => :destroy, :order => 'updated_at desc'
  has_many :uploads, :dependent => :destroy, :order => 'created_at desc'
  has_many :news, :dependent => :destroy, :order => 'created_at desc'
  has_many :events, :dependent => :destroy, :order => 'date desc'
  has_many :blog_entries, :foreign_key => :user_id
  has_many :registers
  has_many :members
  has_many :teams, :through => :members
  accepts_nested_attributes_for :uploads, :allow_destroy => true
  has_attached_file :avatar, :styles => {:thumb=> "70x70#", :small  => "150x150>" }, :default_url => "/images/missing.jpg"

end

上传

  class Upload < ActiveRecord::Base
    include ActiveModel::Validations
    belongs_to :user
  belongs_to :upload_category, :foreign_key => :file_category  
  has_many :upload_images, :dependent => :destroy  
  accepts_nested_attributes_for :upload_images, :reject_if => lambda { |t| t[':upload_images'].nil? }
    has_attached_file :upload,  :path => ":rails_root/:class/:id/:basename.:extension", :url => ":rails_root/:class  /:id/:basename.:extension"
    attr_accessible :file_category, :file_description, :user_id, :upload, :name, :private, :uploads, :upload_images_attributes
    validates_attachment_size :upload, :less_than => 30.megabyte
    validates_presence_of :upload_file_name, :message => "must contain a valid file."
    validates :name, :presence => true
  validates :name, :length => { :maximum => 30 }
    validates_with FileValidator
end

Upload_Images

class UploadImage < ActiveRecord::Base
belongs_to :upload
has_attached_file :image, :styles => { :small => "150x150>", :large => "320x240>"}, :default_url => "/images/missing.jpg"  

end

编辑

如果我拿出

 :reject_if => lambda { |t| t[':upload_images'].nil? }

在我的上传模型中，我得到一个 unkown 属性：当我尝试更新时，我的用户控制器upload_image错误。

Answer 1

有 2 个问题阻止了我的Upload_Image的持久性。

1. 我的upload_image模型中的以下行：reject_if => lambda { |t| t['：upload_images'].nil？ } 导致我的持久性静默失败，因为我尝试保留的文件上传中存在 nil 值。
2. 我得到了未知属性：upload_image因为在我看来我有一个file_field ：upload_image但在我的模型中，我将图像附件称为：image。这导致reject_if lamba 在我的模型中触发