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Description: Paperclip File Management Plugin
Homepage: http://www.thoughtbot.com/projects/paperclip
Clone URL: git://github.com/thoughtbot/paperclip.git 
Add _updated_at. To be used for cache busting.

No tests yet since I had problems getting the suite to run :/
henrik (author)
Wed Jul 02 15:35:48 -0700 2008
commit  429c78cec46f2cf1cd12bce04ce573f2d67f62fc
tree    9e494243091604dbd8ca0c36982fe359b45b5f6e
parent  311732b3b4f8ab4985506e7e2c03af7d57893ff2
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README.rdoc 
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@@ -19,12 +19,14 @@ In your migrations:
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       add_column :users, :avatar_file_name, :string
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       add_column :users, :avatar_content_type, :string
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       add_column :users, :avatar_file_size, :integer
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+      add_column :users, :avatar_updated_at, :integer
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     end
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     def self.down
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       remove_column :users, :avatar_file_name
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       remove_column :users, :avatar_content_type
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       remove_column :users, :avatar_file_size
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+      remove_column :users, :avatar_updated_at
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     end
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   end
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generators/paperclip/templates/paperclip_migration.rb 
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@@ -4,6 +4,7 @@ class <%= migration_name %> < ActiveRecord::Migration
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     add_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_file_name, :string
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     add_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_content_type, :string
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     add_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_file_size, :integer
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+    add_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_updated_at, :datetime
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 <% end -%>
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   end
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@@ -12,6 +13,7 @@ class <%= migration_name %> < ActiveRecord::Migration
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     remove_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_file_name
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     remove_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_content_type
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     remove_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_file_size
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+    remove_column :<%= class_name.underscore.camelize.tableize %>, :<%= attachment %>_updated_at
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 <% end -%>
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   end
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 end
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lib/paperclip/attachment.rb 
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@@ -61,6 +61,7 @@ module Paperclip
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       @instance[:"#{@name}_file_name"]    = uploaded_file.original_filename.strip.gsub /[^\w\d\.\-]+/, '_'
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       @instance[:"#{@name}_content_type"] = uploaded_file.content_type.strip
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       @instance[:"#{@name}_file_size"]    = uploaded_file.size.to_i
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+      @instance[:"#{@name}_updated_at"]   = Time.now
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       @dirty = true
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@@ -230,6 +231,7 @@ module Paperclip
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       @instance[:"#{@name}_file_name"]    = nil
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       @instance[:"#{@name}_content_type"] = nil
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       @instance[:"#{@name}_file_size"]    = nil
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+      @instance[:"#{@name}_updated_at"]   = nil
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     end
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     def flush_errors #:nodoc:
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test/helper.rb 
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@@ -32,6 +32,7 @@ def rebuild_model options = {}
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     table.column :avatar_file_name, :string
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     table.column :avatar_content_type, :string
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     table.column :avatar_file_size, :integer
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+    table.column :avatar_updated_at, :datetime
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   end
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   ActiveRecord::Base.send(:include, Paperclip)

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