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How to Upload a multipage PDF with Paperclip?
class Post < ActiveRecord::Base
  belongs_to :Blogs

  attr_accessible :content, :title, :pdf

  has_attached_file :pdf,
                    :url  => "/assets/products/:id/:style/:basename.:extension",
                    :path => ":rails_root/public/assets/products/:id/:style/:basename.:extension"

  validates_attachment_content_type :pdf,
      :content_type => [ 'application/pdf' ],
      :message => "only pdf files are allowed"
end

<%= form_for ([@post]), :html => { :multipart => true } do |f| %>

<p>
<b> Name </b><br>
    <%= f.file_field :pdf %>
</p>

<p>
  <%= image_tag @post.pdf.url(:original) %>
</p>

<p>
  <%= link_to 'My PDF', @post.pdf.url %>
</p>