view db/migrate/048_allow_null_version_effective_date.rb @ 382:baff1c482d98 feature_113

First cut at making frames optional in mtree output

class AllowNullVersionEffectiveDate < ActiveRecord::Migration
  def self.up
    change_column :versions, :effective_date, :date, :default => nil, :null => true
  end

  def self.down
    raise IrreversibleMigration
  end
end