CSV Data as stream

gistfile1.txt

class PropertiesController < ApplicationController
  include ActionController::Live
  
  before_action :find_county
  
  def index
    response.headers["Content-Type"] ||= 'text/csv'
    response.headers["Content-Disposition"] = "attachment; filename=#{@county.csv_file_name}"
    
    response.stream.write Property::CSV_HEADERS.to_csv
    
    properties = @county.properties.processed
    if params[:with_different_addresses_only]
      properties = properties.where(has_different_addresses: true)
    end  
    
    properties.find_in_batches(batch_size: 1000).each do |group|
      group.each do |property|
        row = []
        Property::CSV_COLUMN_NAME.each do |column|
          row << property.send(column.to_sym).to_s
        end
        response.stream.write row.to_csv
      end
    end
    
    response.stream.close
  end
  
  private
  
  def find_county
    @county = County.find(params[:county_id])
  end  
  
end