view db/migrate/048_allow_null_version_effective_date.rb @ 535:dd9d9c0ff0f9 feature_36

created the helpers to display correctly the My Publications Authors and Projects.

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