paperclip polymorphic nested multi file uploads - ruby-on-rails

Question

Not really any error messages, just no file uploaded!
Please help!!!!
everything get created and is fine apart from the file upload.
Models:
class Assets < ActiveRecord::Base
belongs_to :assetable, :polymorphic => true
delegate :url, :to => :attachment
attr_accessible :asset, :asset_file_name
end
class Video < ActiveRecord::Base
attr_accessible :body, :title, :url, :covers, :assets
has_many :covers, :as => :assetable, :class_name => "Video::Cover", :dependent => :destroy
accepts_nested_attributes_for :covers, :allow_destroy => true
class Video::Cover < Assets
has_attached_file :attachment, :styles => { :small => "300x0>", :large => "800x0>" }
end
end
video controller:
class VideosController < ApplicationController
#load_and_authorize_resource
# GET /videos
# GET /videos.xml
def index
#videos = Video.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => #videos }
end
end
# GET /videos/1
# GET /videos/1.xml
def show
#video = Video.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => #video }
end
end
# GET videos/new
# GET /videos/new.xml
def new
#video = Video.new
1.times do #video.covers.build end
#40.times do #video.images.build end
respond_to do |format|
format.html # new.html.erb
format.xml { render :xml => #video }
end
end
# GET /collections/1/edit
def edit
#video = Video.find(params[:id])
1.times do #video.covers.build end
#1.times do #video.images.build end
end
# POST /videos
# POST /videos.xml
def create
#video = Video.new(params[:video])
respond_to do |format|
if #video.save
format.html { redirect_to(#video, :notice => 'Video was successfully created.') }
format.xml { render :xml => #video, :status => :created, :location => #video }
else
format.html { render :action => "new" }
format.xml { render :xml => #video.errors, :status => :unprocessable_entity }
end
end
end
# PUT /videos/1
# PUT /videos/1.xml
def update
#video = Video.find(params[:id])
respond_to do |format|
if #video.update_attributes(params[:video])
format.html { redirect_to(#video, :notice => 'Video was successfully updated.') }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => #video.errors, :status => :unprocessable_entity }
end
end
end
# DELETE /videos/1
# DELETE /videos/1.xml
def destroy
#video = Video.find(params[:id])
#video.destroy
respond_to do |format|
format.html { redirect_to(videos_url) }
format.xml { head :ok }
end
end
end
Views:
form
<div id="form_bk">
<div id="field_left">
<%= form_for #video, :html => {:multipart => true} do |f| %>
<% if #video.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#video.errors.count, "error") %> prohibited this video from being saved:</h2>
<ul>
<% #video.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div id="cover">
<br />
<h2>Cover Image</h2>
<%= f.fields_for :covers do |cover_image| %>
<% if cover_image.object.new_record? %>
<p><%= cover_image.file_field :attachment %></p>
<% end %>
<% end %>
<%= f.fields_for :covers do |cover_image| %>
<% unless cover_image.object.new_record? %>
<br />
<p>
<%=image_tag cover_image.object.url(:small) %><br />
<br /> Delete cover <%= cover_image.check_box :_destroy %><br /><br />
</p>
<% end %>
<% end %>
</div>
<div id="form_right">
<div class="field">
<%= f.label :title %>
<%= f.text_field :title %>
</div>
<div class="field">
<%= f.label :body %><br />
<%= f.text_area :body %>
</div></div>
<div class="field">
<%= f.label :url %><br />
<%= f.text_area :url %>
</div></div>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
<br />
</div>
Index view
<% #videos.each do |video| %>
<div class="video">
<%- video.covers.each do |cover| %>
<div class="video_cover"><%=link_to image_tag (cover.url(:small)), video %></div>
<% end %>
<div class="video_title">
<%=link_to video.title, video %>
<%= video.body %>
<%= link_to 'Show', video %>
<%= link_to 'Edit', edit_video_path(video) %>
<%= link_to 'Destroy', video, :confirm => 'Are you sure?', :method => :delete %>
</div>
</div>
<% end %>
<br /><br /><br />
<%= link_to 'New Video', new_video_path %>
<%= debug #videos %>