Chatwoot/app/uploaders/attachment_uploader.rb

class AttachmentUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  def store_dir
    if Rails.env.test?
      "#{Rails.root}/spec/support/uploads/attachments/#{model.class.to_s.underscore}/#{model.id}"
    else
      "uploads/attachments/#{model.class.to_s.underscore}/#{model.id}"
    end
  end

  version :thumb, :if => :image? do
    process resize_to_fill: [280,280]
  end

  protected

    def image?(new_file)
      model.image?
    end
end