Paperclip Tutorial

script/plugin install git://github.com/thoughtbot/paperclip.git
script/generate paperclip product photo
rake db:migrate

# models/product.rb
has_attached_file :photo, :styles => { :small => "150x150>" },
:url => "/assets/products/:id/:style/:basename.:extension",
:path => ":rails_root/public/assets/products/:id/:style/:basename.:extension"

validates_attachment_presence :photo
validates_attachment_size :photo, :less_than => 5.megabytes
validates_attachment_content_type :photo, :content_type => ['image/jpeg', 'image/png']


# views
<%= image_tag @product.photo.url(:small) %>


<% form_for @product, :html => { :multipart => true } do |f| %>
...
<%= f.file_field :photo %>
...
<% end %>

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