Simplest way to add a thumb size to a model using Paperclip in Rails -

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i have rails model uses paperclip , has many thumb sizes. add new thumb size , generate size if possible - it unnecessary regenerate of old thumbs again. photo.find(123).photo.reprocess!(:new_size) perfect unfortunately doesn't exist. know simple way achieve this?

thanks.

the thumb-size can set in model of pictures (see paperclip):

class user < activerecord::base   has_attached_file :avatar, :styles => { :medium => "300x300>", :thumb => "100x100>" } end

as far remember should possible regenerate deleting old thumbnails. however, there's rake-task it: 

rake paperclip:refresh class=yourmodelname

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