Resize existing images to new style in paperclip & RMagick
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.
try this rake task provided by paperclip
rake paperclip:refresh:missing_styles