Resize existing images to new style in paperclip & RMagick

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You want the reprocess! method of Paperclip::Attachment. See the docs.

class User < ActiveRecord::Base
  has_attached_file :avatar, :styles => { :medium => "300x300>", :thumb => "100x100>" }
end

# Console...
>> User.find_each { |u| u.avatar.reprocess! }

Also, according to the comments before the reprocess! method, there’s a paperclip:refresh Rake task, which might be easier.

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