Share tasks

[Chais]

It would be nice to be able to share tasks to other users. Possibly via some sort of assignment. So tasks could be assigned to one or more users and then appear in their lists as well.
If a user changes the task's completion or adds a comment the other assignees should see the change.
A user could be given the possibility to reject a task. In that case the task shouldn't appear on that user's list but should not be deleted and still appear on the other assignee's lists. The creator of the task could receive a notification in that case.

[raimund-schluessler]

Right now you can use the share feature of the calendar app to share whole lists with other users. This way all users can work together on all tasks on this list. I plan on implementing the interface for sharing lists into the task app, see #6.
However, I am not sure, if it's easily possible to only share single tasks (or events regarding the calendar app). Maybe, some changes are necessary to the calendar app, maybe it isn't possible at all.

To assigning users to a task is also a planned feature, see #7. But I guess this won't be able using CalDAV, so these assignments won't sync with standard CalDAV clients.

[raimund-schluessler]

I had a look at sharing single events and it should be possible in principle as sharing single events is possible in the calendar app too.

However, the feature is broken in the calendar app at the moment, see owncloud/calendar#264. I will wait until this is finally fixed in the calendar app, before I implement this in tasks.

[e-alfred]

Anything new on this issue? Owncloud is now at 9.1 and this feature would be great for users to share tasks with their status/due date/start date and so on.