educoder/db/migrate/20191223113621_modify_task_pass_for_challenges.rb

class ModifyTaskPassForChallenges < ActiveRecord::Migration[5.2]
  def change
    Challenge.find_each do |challenge|
      task_pass = challenge.task_pass.gsub("", "").gsub("rac", '\frac')
      challenge.update_attribute(:task_pass, task_pass)
    end
  end
end