code: def find_embedded_images
        text = self.fields.values.join(' ')
        matches = text.scan(/ei=([^&]*)/)
        encoded_ids = matches.map(&:first)
        ids = encoded_ids.map { |eid| Base64.urlsafe_decode64(URI.unescape(eid)) }
        EmbeddedImage.includes(:embeddable).find(ids)
      end
docs: Search all of the fields text and create an array of all found
   Simplec::EmbeddedImages.
  
   @return [Array] of Simplec::EmbeddedImages