ruby on rails - Paperclip, multiple attachments and validation -

does have rails 3 example of multiple attachments working validation on multipart form? i've been trying working forever (and have found every blog post , message could, none cover situation, , docs don't @ all).

the first problem examples use 'new_record?' in view template, returns true in new/create sequence when validation fails because no model instances have been saved (so no 'id' value). if start 5 model instances/file inputs , upload 1 file, have 6 file inputs presented when re-render new view, , 'unless' clause fails same reason , no thumbnails presented.

i want preserve link uploaded file (and know possible--they're living in temp directory) while presenting validation errors user other required fields.

somebody somewhere must have working paperclip. ;)

the way i'm using:

i have properties has many photos (10 in case). going code whe have:

in properties controller:

 def new     @search = property.search(params[:search])     @property = property.new     10.times { @property.photos.build }          respond_to |format|       format.html # new.html.erb       format.xml  { render :xml => @property }     end   end    # /properties/1/edit   def edit     @search = property.search(params[:search])     @property = property.find(params[:id])      # se o usuário atual dono da propriedade     if current_user.id == @property.user_id         @photos = photo.where("property_id = ?", @property.id)         @n = @photos.count         @n = 10-@n               @n.times { @property.photos.build }     else         render :action => "show"     end    end 

10.times "render" 10 times photo field in view. when in edit form, apper photo fields lefting. exemple: @ 1st time uploaded 3 photos, if want upload more, 7 fields appear.

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in property model have:

class property < activerecord::base     attr_accessible :photos_attributes, :logradouro, :complemento, :wc, :negocio, :cep, :vagas, :valor,      :quartos, :uf, :area, :bairro, :suites, :salas, :numero, :cidade, :descricao,     :status, :tipoimovel     has_many :photos     accepts_nested_attributes_for :photos, :allow_destroy => true  end 

this allow photos uploaded.

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photo model:

class photo < activerecord::base   belongs_to :property        has_attached_file :photo, :styles => { :small => "100x100>", :medium => "530>x530", :large => "800x800>" }   validates_attachment_presence :photo   validates_attachment_size :photo, :less_than => 500.kilobytes end 

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in form partial:

<div id="new_up">                         <%= f.fields_for :photos |p| %>                 <% if p.object.new_record? %>                     <p><%= p.file_field :photo %>                        <%= p.radio_button :miniatura, true -%>                     </p>                     <% end %>             <% end %>           </div>           <div id="old_up">             <h4>imagens atuais</h4>             <% f.fields_for :photos |p| %>                    <% unless p.object.new_record? %>                        <div style="float: left;">                         <%= p.radio_button :miniatura, true -%>                         <%= link_to image_tag(p.object.photo.url(:small)), p.object.photo.url(:original) %>                         <%= p.check_box :_destroy %>                                 </div>                   <% end %>            <% end %>          </div>