migrate

# File activerecord/lib/active_record/tasks/database_tasks.rb, line 164
      def migrate
        raise "Empty VERSION provided" if ENV["VERSION"] && ENV["VERSION"].empty?

        verbose = ENV["VERBOSE"] ? ENV["VERBOSE"] == "true" : true
        version = ENV["VERSION"] ? ENV["VERSION"].to_i : nil
        scope = ENV["SCOPE"]
        verbose_was, Migration.verbose = Migration.verbose, verbose
        Migrator.migrate(migrations_paths, version) do |migration|
          scope.blank? || scope == migration.scope
        end
        ActiveRecord::Base.clear_cache!
      ensure
        Migration.verbose = verbose_was
      end