Rails 4，Paperclip和多态关联

我有2个模型：News和Uploadedfile

class News < ActiveRecord::Base has_many :uploadedfiles, as: :parent attr_accessible :title, :content, :author end class Uploadedfile < ActiveRecord::Base belongs_to :parent, polymorphic: true has_attached_file :url attr_accessible :url_file_name, :url_content_type, :url_file_size, :url_updated_at end 

forms：

当我提交表单时，我的表uploadedfile不会更改

问题出在哪儿？ 谢谢！

Answer 1

我认为你嵌套了adebute :uploadedfiles

 class News < ActiveRecord::Base has_many :uploadedfiles, as: :parent attr_accessible :title, :content, :author, :uploadedfiles_attributes accept_nested_attributes_for :uploadedfiles end 

并以forms：改变：

  <%= f.fields_for :uploadedfile, f.uploadedfile.new do |uf| %> 

至：

 <%= f.fields_for :uploadedfiles, Uploadedfile.new do |uf| %> 

Answer 2

我不认为你需要多态关联。 这是一种更易读的方法：

 class News < ActiveRecord::Base has_many :uploadedfiles attr_accessible :title, :content, :author accept_nested_attributes_for :uploadedfiles end class Uploadedfile < ActiveRecord::Base belongs_to :news has_attached_file :url attr_accessible :url_file_name, :url_content_type, :url_file_size, :url_updated_at end 

*请注意，我已添加了accept_nested_attributes_for

forms：

 <%= form_for(@news) do |f| %> 
 <%= f.fields_for :uploadedfiles do |uf| %> <%= uf.label :url %>
 <%= uf.file_field :url %> <% end %> 
 
 <%= f.submit %> 
 <% end %>