ruby on rails 3 - Accessing to an image instance with carrierwave and fog -

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i'm trying use this solution dimensions of image. in development works great, in staging (using fog) img = ::magick::image::read(@file.file).first throws me: private method 'file' called #<carrierwave::storage::fog::file:0x00000008fe28d0>

how can retrieve file fog?

update:

i'm using carrirwave_backgrounder process images asynchronously. part of code:

# uploader def geometry   @geometry ||= get_geometry end  def get_geometry   if(@file)     img = ::minimagick::image.open(@file.file)     @geometry = {width: img[:width], height: img[:height]}   end end  # model mount_uploader :image, imageuploader process_in_background :image before_save :set_dimensions   def set_dimensions   geometry = self.image.geometry   self.width = geometry[:width]   self.height = geometry[:height] end

i've figured out error appears when update model, not when created, i've changed callback before_create :set_dimensions , works fine. suppose because when i'm updating, file in assets host, guessing.

change file url, be:

img = ::minimagick::image.open(@file.url)

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