Review of the uploaders

Rake task to recreate version: uploader:recreate or uploader:recreate name1 name2 ...

lib/tasks/uploader.rake

@@ -0,0 +1,40 @@
+namespace :uploader do
+	task :recreate => :environment do
+		mongoid_collections = Mongoid.database.collections.reject{|c| c.name.include?('.')}
+		ARGV.shift
+		if ARGV.present?
+			uploaders = []
+			ARGV.each{ |arg|
+				task arg.to_sym do ; end
+				uploaders << arg
+			}
+		else
+			uploaders = %w(AvatarUploader ImageUploader)
+		end
+		klasses = mongoid_collections.inject([]) { |klasses, coll|
+			if klasses.blank?
+				klasses = coll.find().map{|c| c['_type']}.uniq.compact
+			else
+				klasses += coll.find().map{|c| c['_type']}.uniq.compact
+			end
+			klasses
+		}
+		to_recreate = klasses.inject([]) { |names, name|
+			klass = name.constantize rescue nil
+			klass.uploaders.each_value{ |value|
+				if uploaders.include?(value.to_s) && !names.include?(name)
+					names << name
+				end
+			} unless klass.nil?
+			names
+		}
+		to_recreate.each { |name|
+			klass = name.constantize
+			klass.all.each{ |object|
+				klass.uploaders.each_key{ |key|
+					object.send(key).recreate_versions! if object[key] rescue nil
+				}
+			}
+		}
+	end
+end