user_importer.rb

# app/services/importers/users.rb

module Importers
  class Users
    include CableReady::Broadcaster
  
    def initialize(file:)
      @file = file
    end
    
    def import_csv
      counter = 0
      total = CSV.read(@file.path, headers: true).length
      
      CSV.foreach(@file.path, headers: true) do |csv_row|
        counter += 1
        
        ...
          
        cable_ready[UserChannel].text_content(
          selector: '#processed-row-number-container',
          text: counter
        ).broadcast_to(Current.user) 
        # more about Current.user -> https://api.rubyonrails.org/classes/ActiveSupport/CurrentAttributes.html
      end
    end
  end
end