ruby-on-rails - How to resize image before_save with dragonfly?

Question

In my model i have:

attr_accessible :photo
image_accessor :photo
before_save :resize_image

def resize_image
  self.photo = self.photo.process(:resize, '40x40')
end

but after save it removes my photo_uid from record in database (or doesnt write photo_uid at all)

Answer 1

呵呵，我发现：

image_accessor :photo do
   after_assign :resize_image
end

def resize_image
   photo.process!(:resize, '1000x650>')
end