我有以下代碼:Rails的多態嵌套屬性與fields_for無法保存
class User < ActiveRecord::Base
has_one :profile_image, :as => :owner, :class_name => 'Image'
has_one :cover_image, :as => :owner, :class_name => 'Image'
end
和:
class Image < ActiveRecord::Base
belongs_to :owner, polymorphic: true
end
現在我想建立一個表單,用戶可以更新他/她圖像和他/她的電子郵件。我建立的形式是這樣的:
= form_for @user, :url => pages_upload_path, :html => { :multipart => true } do |form|
= form.text_field :email
= form.fields_for :profile_image_attributes do |profile_image|
= profile_image.file_field :file
= form.fields_for :cover_image_attributes do |cover_image|
= cover_image.file_field :file
= submit_tag("Upload")
然而,這編譯以下PARAMS哈希:
[2] pry(#<PagesController>)> params[:user]
=> {"email"=>"[email protected]",
"profile_image"=>
{"file"=>
#<ActionDispatch::Http::UploadedFile:0x007f8a41365d30
@content_type="image/png",
@headers=
"Content-Disposition: form-data; name=\"user[profile_image][file]\"; filename=\"Screenshot 2014-04-27 02.57.34.png\"\r\nContent-Type: image/png\r\n",
@original_filename="Screenshot 2014-04-27 02.57.34.png",
@tempfile=
#<File:/var/folders/_2/rgn574910638hqstf85233hh0000gn/T/RackMultipart20140518-88429-15129ld>>},
"cover_image"=>
{"file"=>
#<ActionDispatch::Http::UploadedFile:0x007f8a413653d0
@content_type="image/png",
@headers=
"Content-Disposition: form-data; name=\"user[cover_image][file]\"; filename=\"Screenshot 2014-04-27 02.57.34.png\"\r\nContent-Type: image/png\r\n",
@original_filename="Screenshot 2014-04-27 02.57.34.png",
@tempfile=
#<File:/var/folders/_2/rgn574910638hqstf85233hh0000gn/T/RackMultipart20140518-88429-1oosnc5>>}}
但是當我保存這個,像這樣,我得到以下錯誤:
@user = User.last
@user.update_attributes(params.fetch(:user, {}).permit(:email, :profile_image => [:file]))
# ActiveRecord::AssociationTypeMismatch: Image(#70115863220300) expected, got
# ActionController::Parameters(#70115879244320)
# from /Users/kaspergrubbe/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems
# /activerecord-4.1.0/lib/active_record/associations/association.rb:216:in
# `raise_on_type_mismatch!'
我怎樣才能讓它接受我的屬性profile_image
?
刪除':class_name =>'Image'可以解決我猜想的問題。 – Pavan
請發佈'控制器代碼'。 – Pavan