controller

 def create

    uploaded_file = params[:batch_payouts_csv] 
    unless valid_file_type?(uploaded_file) 
      render json: {"error_message" => I18n.t("merchant.messages.errors.invalid_file_type")}, status: 400 
      return 
    end 

    uploaded_csv_file = Batch::CsvFile.new(uploaded_file.path) 
    unless uploaded_csv_file.valid_size? 
      render json: {"error_message" => I18n.t("merchant.messages.errors.exceeding_file_size")}, status: 400 
      return 
    end 

    filename_with_timestamp = "#{DateTime.now.strftime("%Q")}_#{uploaded_file.original_filename}"
    merchant_employee = @current_user 
    currency = Currency.find(batch_payout_params[:currency_id]) 
    batch_payout = BatchPayout.create(merchant_employee: merchant_employee, currency: currency) 
 
    unless request.xhr? 
      response = {filename: filename_with_timestamp, status: "success", location: merchants_batch_payouts_path(batch_payout)} 
      render text: response.to_json, status: 201 \
      return 
    end 
    render json: {"filename" => filename_with_timestamp}, location: merchants_batch_payouts_path(batch_payout), status: 201 
  end