Ruby on rails 接受\u嵌套的\u属性\u，具有\u多个多态性

我用回形针上传多个附在学生课程签名上的文件，但我失败了

型号

class StudentCourseAssignment < ActiveRecord::Base
    attr_accessible :score, :comment, :finish_status,:attachments
    accepts_nested_attributes_for :attachments
    belongs_to :assignment
    belongs_to :user
    has_many :attachments ,:as => :attachmentable,:dependent => :destroy
end

class Attachment < ActiveRecord::Base
    attr_accessible :user_upload 
    belongs_to :attachmentable , :polymorphic => true
    has_attached_file :user_upload
end

**看法**

<%= form_for @sca, :url => assignment_student_course_assignments_path(@assignment),
:html => { :id => 'student-assignment-form', :multipart => true } do |f| %>
file:
<%= f.fields_for :attachments do |a_f| %>
<%= a_f.file_field :user_upload %>
<%= submit_tag "create" %>
<% end%>
<% end %>

如果remove为：附件接受\u嵌套的\u属性，\u，它仍然是错误的

Attachment(#70201401779680) expected, got Array(#70201383294620)

希望您的帮助！谢谢

变化

发件人：

致：

---

我知道这是一个老问题，但我想你需要离开

接受：附件的\u嵌套\u属性\u

侍候

有很多附件，：as=>：attachmentable，：dependent=>：destroy

我自己曾经在一个项目中遇到过这个问题；可以肯定的是，

接受

的_嵌套的_属性_，希望在调用关系之前已经声明了关系

No association found for name `attachments'. Has it been defined yet?

Attachment(#70201401779680) expected, got Array(#70201383294620)

attr_accessible :score, :comment, :finish_status,:attachments

attr_accessible :score, :comment, :finish_status,:attachments_attributes