#image_uploader.rb
class ImageUploader < CarrierWave::Uploader::Base
  include Cloudinary::CarrierWave
  ...
  def public_id
    return model.title.parameterize+SecureRandom.uuid
  end
end

# models/author.rb
class Author < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end
# views/admin/authors/_form.html.rb
<div class="field">
  <%= f.label :image %><br>
  <%= f.hidden_field :image_cache %>
  <%= f.file_field :image %>
  <%= cl_image_tag(@article.image_url, :width => 50, :height => 50, :crop => :fill) if @article.image? %>
</div>


#controllers/admin/authors_controller.rb

module Admin
  class AuthorsController < ApplicationController

    def update
      if @author.update(author_params)
        redirect_to admin_authors_path, notice: 'author was successfully updated.'
      else
        render :edit
      end
    end

    private

    def author_params
      params.require(:author).permit(:name, :image, :deleted, :email, :twitter, :facebook, :bio_az, :bio_en)
    end
  end
end