NoMethodError Exception: super: no superclass method 'transformation_command' for Paperclip::Cropper

Question

I am following Episode: 182-cropping-images for cropping user profile image.

AR relation is User has one Profile Image: In User model:

 has_one :profile_image, :as => :imageable, :class_name => 'ProfileImage', :dependent => :destroy

In ProfileImage Model:

 class ProfileImage < Image
   has_attached_file :data, :styles => {
  :large => "160x160>",
  :grid => "114x114>",
  :medium => "80x80>",
  :list => "60x60>",
  :square => "32x32!",
  :tiny => "20x20!",
  :icon => "16x16!"
}, :processors => [:cropper]

attr_accessor :crop_x, :crop_y, :crop_w, :crop_h


def cropping?
  !crop_x.blank? && !crop_y.blank? && !crop_w.blank? && !crop_h.blank?
end

def avatar_geometry(style = :original)
  @geometry ||= {}
  @geometry[style] ||= Paperclip::Geometry.from_file(data.path(style))
end

In lib/paperclip_processors/cropper.rb lib:

 module Paperclip
  class Cropper < Thumbnail
    def transformation_command
      if crop_command
        crop_command + super.join(' ').sub(/ -crop \S+/, '').split(' ')
      else
        super
      end
    end

    def crop_command
      target = @attachment.instance
      if target.cropping?
        ["-crop", "#{target.crop_w}x#{target.crop_h}+#{target.crop_x}+#{target.crop_y}"]
      end
    end
  end
end

and all other things like Episode: 182-cropping-images with solution Now, I am getting error:

 NoMethodError Exception: super: no superclass method  'transformation_command' for Paperclip::Cropper

in line:

crop_command + super.join(' ').sub(/ -crop \S+/, '').split(' ')

If I remove, + super.join(' ').sub(/ -crop \S+/, '').split(' ')

It crops all images style into same height width. Please guide.

Answer 1

Only looking at the error you're getting...

My guess is that this line is falling through to the else

if crop_command
  crop_command + super.join(' ').sub(/ -crop \S+/, '').split(' ')
else
  super
end

And your Thumbnail class isn't setup properly, so when you call super its looking for Thumbnail#transformation_command which doesn't exist.

Looking at the docs, this method relies on ImageMagick being installed and setup correctly.

have you followed this step?