ActiveRecord migration for increasing MySQL column length from TEXT to MEDIUMTEXT

20130401200058_increase_delayed_jobs_handler_length.rb

class IncreaseDelayedJobsHandlerLength < ActiveRecord::Migration
  def up
    # Increase to MEDIUMTEXT (16,777,215 bytes)
    change_column(:delayed_jobs, :handler, :text, limit: 16.megabytes - 1)
  end

  def down
    # Back to default TEXT (65,535 bytes)
    change_column(:delayed_jobs, :handler, :text)
  end
end