view db/migrate/048_allow_null_version_effective_date.rb @ 337:d67a7d67b159 cannam-pre-20110113-merge

Ensure the repository URL is marked read-only for external repos; add note about being updated hourly

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