Rails + Paperclip : 중첩 된 속성 file_field 양식 도우미가 작동하지 않습니까?

Question

나는 형태가 있습니다

<%= form_for [:admin, @category], :html => { :multipart => true } do |f| %> 

    <%= f.collection_select(:parent_id, Category.all, :id, :title, include_blank: true) %><br /> 

    <%= f.label :title %><br /> 
    <%= f.text_field :title %><br /> 

    <%= f.label :description %><br /> 
    <%= f.text_area :description %><br /> 



    <%= fields_for :category_image do |category_image_fields| %> 
     <%= category_image_fields.file_field :attachment %><br /> 
    <% end %> 

    <%= f.submit %> 


    <% end %> 

을하지만 난 그것을 동결하고 better_errors 보석을 사용하여 시도 할 때 작동하지 않는 것 :

>> params 
    => {"utf8"=>"✓", "authenticity_token"=>"JWT+P6OQHKQC+sx5ytNoyAaGEKwCHb15Mb0H7FSJlTM=", "category"=>{"parent_id"=>"3", "title"=>"ffff", "description"=>"ffff"}, "category_image"=>{"attachment"=>#<ActionDispatch::Http::UploadedFile:0x007fdd375e9590 @original_filename="bacon.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"category_image[attachment]\"; filename=\"bacon.jpg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<File:/var/folders/nw/zzv_cpt94_18vhvmcwk26gh80000gr/T/RackMultipart20131017-37289-1k42gos>>}, "commit"=>"Create Category", "action"=>"create", "controller"=>"admin/categories"} 
    >> c=Category.new(params[:category]) 
    => #<Category id: nil, title: "ffff", description: "ffff", parent_id: 3, created_at: nil, updated_at: nil> 
    >> c.category_image 
    => nil 

이것은 클립을 사용하여 내 모델입니다 이미지의 약자

class CategoryImage < Asset #<-- trying to reuse it for other models too 
    belongs_to :category 
end 



class Asset < ActiveRecord::Base 
    has_attached_file :attachment 
    validates_attachment_presence :attachment 
    validates_attachment_content_type :attachment, 
            :message => "Please upload correct format", 
            :content_type => %w(image/jpeg image/png image/pjpeg image/x-png image/gif) 

    has_attached_file :attachment, :styles => { :small => '100' } 

    attr_accessible :attachment 
end 

이 내 카테고리의 모델입니다해야 has_one 이미지 :

class Category < ActiveRecord::Base 
    attr_accessible :title, :description, :category_image, :parent_id 

    has_many :subcategories, class_name: 'Category', foreign_key: 'parent_id', dependent: :destroy 
    belongs_to :parent_category, class_name: 'Category', foreign_key: 'parent_id' 

    has_many :books 
    has_one :category_image 
    accepts_nested_attributes_for :category_image 

    validates_presence_of :title, :description 
end 

Answer 1

-> 당신은 양식 :

<%= f.fields_for :category_image do |category_image_fields| %> 
    <%= category_image_fields.file_field :attachment %><br /> 
<% end %> 

에 f.fields_for 필요 ->- 당신은 중첩 된 속성이

class Category < ActiveRecord::Base attr_accessible :title, :description, :category_image, :parent_id, :category_image_attributes 

을 통과 할 수 PARAMS 허용해야> 개체 작성

컨트롤러 작업 (일반적으로 새 작업이지만 nother), f.fields_for가 목표로하는 객체를 빌드해야합니다.

def new 
    @category = Category.new 
    @category.build_category_image 
end