Redmine

      def set_current_plugin(p)

	      @current_plugin = p

      end

      def get_all_versions(plugin = @current_plugin)

        # Delete migrations that don't match .. to_i will work because the number comes first

        @all_versions ||= {}

        @all_versions[plugin.id.to_s] ||= begin

          sm_table = ::ActiveRecord::SchemaMigration.table_name

          migration_versions  = ActiveRecord::Base.connection.select_values("SELECT version FROM #{sm_table}")

          versions_by_plugins = migration_versions.group_by { |version| version.match(/-(.*)$/).try(:[], 1) }

          @all_versions       = versions_by_plugins.transform_values! {|versions| versions.map!(&:to_i).sort! }

          @all_versions[plugin.id.to_s] || []

        end

      end

          ctx = MigrationContext.new(plugin.migration_directory)

          ctx.set_current_plugin(plugin)

          ctx.migrate(version)