[Kde-pim] Akonad tags support broken?

[Krzysztof Nowicki]

Hi,

While working on EWS support and server-side tags I've noticed that the tag 
support in Akonadi/KDE PIM is somewhat incomplete/broken.

Tags support remote identifiers (similar to items and collections). 
Unfortunately adding remote IDs to tags is broken at the Akonadi database 
layer (at least with PostgreSQL). The autogenerated SQL code tries to return 
the id of the row, which is not present in the 
'tagremoteidresourcerelationtable' as it is an n:m relation table. I have 
managed to work around this by manually adding the id column to that table.

The ObserverV4::tagAdded() is not guaranteed to be called for all tags in the 
database. This leads to a situation where the resource receives a call to 
ObserverV4::itemsTagsChanged() with tags that it has never seen before - I 
would expect an ObserverV4::tagAdded() call for each of them that doesn't have 
a remote identifier for this resource.

I have enabled fetching tags in the change recorder so that I can see a full 
list of tags for an item that I get in ObserverV4::itemsTagsChanged(). 
Unfortunately the tags I don't contain the gid, which I need to identify them 
in the absence of remote ID. It seems there is no way to tell a TagFetchScope 
to fetch the gid of the tag.

Does this all mean that tag support is incomplete and should not be used? I 
would really love to implement this as Exchange allows to do it nicely and I 
personally use tags very often.

Regards
Chris

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