instructure/canvas-lms · error · ActiveRecord::Rollback

Failed creating an event for the series, update not saved

Error message

Failed creating an event for the series, update not saved

What it means

Guard inside update_from_series: while growing a recurring series (the updated RRULE yields more occurrences than existing events), building and saving a new CalendarEvent occurrence failed (grant/save returned false). The transaction rolls back so no partial series is persisted.

Solutions

1. Inspect the new event's errors for why creation failed (invalid params_for_update, duration, or context restrictions)
2. Ensure the caller has permission to create events in the target context
3. Retry with corrected series update params

When it happens

Trigger: Thrown at app/controllers/calendar_events_api_controller.rb:1101 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of instructure/canvas-lms@1c9f0bb801 (2026-09-15). Data as JSON: /api/errors/a16f8522902ad740. Report an issue: GitHub.

Appendix: source

Thrown at app/controllers/calendar_events_api_controller.rb:1101

            end
          end
          events = events.take(dtstart_list.length)
        end

        if new_series_head
          events[0].series_head = true
        end

        dtstart_list.each_with_index do |dtstart, i|
          params_for_update = set_series_params(params_for_update, dtstart, duration)
          event = events[i]
          event.update_all = true if which != "one" && event&.series_uuid && event.series_head
          if event.nil?
            event = target_event.context.calendar_events.build(params_for_update)
            events << event
            unless event.grants_any_right?(@current_user, session, :create)
              error = { message: t("Failed creating an event for the series, update not saved"), status: :unauthorized }
              raise ActiveRecord::Rollback
            end

            unless event.save
              error = { message: t("Failed creating an event for the series, update not saved") }
              raise ActiveRecord::Rollback
            end
          else
            event.updating_user = @current_user
            unless event.grants_any_right?(@current_user, session, :update)
              error = { message: t("Failed updating an event in the series, update not saved"), status: :unauthorized }
              raise ActiveRecord::Rollback
            end

            unless event.update(params_for_update)
              error = { message: t("Failed updating an event in the series, update not saved") }
              raise ActiveRecord::Rollback
            end
          end

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