Paperclip :style depending on model (has_many polymorphic images)

Question

I have set up my models to use a polymorphic Image model. This is working fine, however I am wondering if it is possible to change the :styles setting for each model. Found some

Answer 1

I've also met with the same problem and after searching for an elegant solution I didn't found anything "really" useful. So, here's my simple solution which seems alright for now; (tho I'm not sure if it has any downsides for the moment)

In model;

class Asset < ActiveRecord::Base
  belongs_to :assetable, polymorphic: true

  has_attached_file :attachment,  path: ":rails_root/#{path}/assets/images/:style/:filename",
                                  url: '/assets/images/:style/:filename',
                                  styles: -> (a) { a.instance.send(:styles) }
private
  def styles
    raise 'Undefined assetable.' unless assetable

    if assetable.class == Photo
      { small: 'x40', medium: '120x', large: '300x' }
    elsif assetable.class == Avatar
      { small: 'x40', medium: '120x', large: '300x' }
    else
      raise "Styles for #{assetable.class} is not defined."
    end
  end
end

In controller;

@photo = Photo.new
@photo.build_image(assetable: @photo, attachment: params[:photo][:image_attributes][:attachment])
@photo.save