Google created item is deleted during synchronization

Checklist:-

• Upgrade to the latest release (alpha if available)
• Reproduce the issue
• Complete the information below
• Provide your OGcalsync.log file (see how-to)

OGCS Version: v2.8.6.0 Edition: Portable
Sync Direction: O<->G

Bug Description
The event “Deutsch” is created in Google. Then it was synchronized to Outlook. After some time synchronization deleted it from both Google and Outlook. After restoring the event in Google next synchronization deletes it again.

Steps to Reproduce the Issue
Not sure what exactly events are deleted. Before I had a situation that some (not all) events created in Outlook where deleted.

Any other information
Log can be found here: https://gist.github.com/ralfeus/28037cbe06e729230dfd97af3d18c918

[phw198]

Thanks for getting to the bottom of that and reporting back - however, this is essentially what’s documented in the limitations section of the wiki. Never changing the original item of a calendar rather undermines the concept of two-way sync, and is much more likely to cause confusion with users.

It looks like you are only syncing 30 days into the future? I’d suggest you increase that sync window so it’s less likely you’ll move a Google item out of the synced date range, and therefore won’t encountered this limitation.

[ralfeus]

Ok, I’ve encountered the issue again with different item. This time it’s not recurrent Steps to reproduce:

1. Create item in Google
2. Perform sync
3. Move item in Google outside of synchronization time range
4. Perform sync. It will delete the item in the Outlook.
5. Wait for item to be in synchronization time range
6. Perform sync
7. Enjoy item deletion in Google

I suppose the reason is that following happens:

1. Item can’t be found and therefore considered as deleted
2. The corresponding Outlook item is deleted. Outlook attributes though aren’t cleaned up from Google item
3. When the Google item is in sync range it checks the item, finds Outlook attributes but doesn’t find corresponding Outlook item.
4. Because there is no corresponding Outlook item the item in general is considered deleted and is deleted from Google too

I would say the solution would be to have a source attribute set for each item and update only ones that are created by the synchronizer. Original items both in Outlook and Google must not be changed