You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20120412072508_add_rendered_notes.rb
    path of file: ./repos/tracks/db/migrate
    
    the code of the file until where you have to start completion: class AddRenderedNotes < ActiveRecord::Migration[5.2]
  def self.up
    add_column :todos, 'rendered_notes', :text
    
    Todo.reset_column_information

    say "Clearing show_from dates from completed todos"
    # clear up completed todos that have show_from set. These could have been left over from before the AASM migration
    Todo.completed.where( "NOT(show_from IS NULL)" ).each {|t| t.show_from=nil; t.save!}
    
    say "Generating new column values from notes. This may take a while."
    # Call save! on each todo to force generation of rendered_todos
    i=0; max = Todo.al
    
  def self.up
    add_column :todos, 'rendered_notes', :text
    
    Todo.reset_column_information

    say "Clearing show_from dates from completed todos"
    # clear up completed todos that have show_from set. These could have been left over from before the AASM migration
    Todo.completed.where( "NOT(show_from IS NULL)" ).each {|t| t.show_from=nil; t.save!}
    
    say "Generating new column values from notes. This may take a while."
    # Call save! on each todo to force generation of rendered_todos
    i=0; max = Todo.all.count; start = Time.now
    Todo.all.each do |todo|
      todo.save(:validate => false)
      i = i + 1
      if i%250==0
        elapsed_sec = (Time.now-start)
        remaining = (elapsed_sec / i)*(max-i)
        say "Progress: #{i} / #{max} (#{(i.to_f/max.to_f*100.0).floor}%) ETA=#{remaining.floor}s"
      end
    end