Added migration script to add screenshots to Paperclip

lib/tasks/screenshots_to_paperclip.rake

@@ -0,0 +1,32 @@
+desc "Convert images from the original screenshots directory tree to paperclip-styled images"
+
+task :screenshots_to_paperclip => :environment do
+  Rails.logger = Logger.new(STDOUT)
+  Rails.logger.level = Logger::INFO
+  #Rails.logger.level = Logger::DEBUG
+
+  base_path = Rails.root.join('public')
+
+  Rails.logger.info "Iterating over screenshots"
+  Screenshot.all.each do |screenshot|
+    path = File.join(base_path, screenshot.image_url(:large))
+    Rails.logger.info "- #{screenshot.id} (package: #{screenshot.package.name}) (path: #{path})"
+
+    # Check that the file actually exists
+    unless File.file? path
+      Rails.logger.error "Screenshots not found at #{path}. Skipping."
+      next
+    end
+
+    # Has the screenshot been migrated already?
+    if screenshot.image.exists?
+      Rails.logger.error "Screenshot already migrated. Skipping."
+      next
+    end
+
+    File.open(path, 'rb') do |image_file|
+      screenshot.image = image_file
+      screenshot.save
+    end
+  end
+end