to run do >>>>>>>>> rake experiment:export

experiment.rake

namespace :experiment do
    desc "This task will export Jobs into a csv file"
    task export: :environment do
        require 'csv'
        number_of_rows = Job.last.id - Job.first.id
        maximum_db_rows = 4000
        if number_of_rows > maximum_db_rows
            posts = Job.all
            CSV.open('jobs.csv', 'a+') do |csv_object|
                posts.each_with_index do |post, i|
                if post.id < (Job.first.id+(number_of_rows-maximum_db_rows))
                    csv_object << [post.id, post.title, post.company, post.location, post.description, post.industry, post.url, post.tags, post.created_at, post.updated_at, post.tech_stack, post.grouping, post.yearsofexperience, post.job_board ]
                    puts 'Added: ' + post.title + ':' + post.location + ':' + post.description 
                    Job.delete(post.id)
                end
            end
            end
        else
            puts 'You are still within the '  + maximum_db_rows.to_s  + ' maximum number of rows limit.' 
        end
    end
end