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migrator.rb：源码内容

							module Migrator
  mattr_accessor :offer_migration_when_available
  @@offer_migration_when_available = true
  def self.migrations_path
    "#{RAILS_ROOT}/db/migrate"
  end
  def self.available_migrations
    Dir["#{migrations_path}/[0-9]*_*.rb"].sort_by { |name| name.scan(/d+/).first.to_i }
  end
  def self.current_schema_version
    ActiveRecord::Migrator.current_version rescue 0
  end
  def self.max_schema_version
    available_migrations.size
  end
  def self.db_supports_migrations?
    ActiveRecord::Base.connection.supports_migrations?
  end
  def self.migrate(version = nil)
    ActiveRecord::Migrator.migrate("#{migrations_path}/", version)
  end
end

						