[Qgis-developer] $id not working as default value

[Neumann, Andreas]

Hi Nyall, 

Thanks for clarifying. 

This needs to be properly documented and taught in QGIS courses. 

Andreas 

On 2016-12-27 02:03, Nyall Dawson wrote:

> On 23 December 2016 at 23:37, Paolo Cavallini <cavallini at faunalia.it> wrote: Il 23/12/2016 14:32, Giovanni Manghi ha scritto:
> 
> The solution from the Gitter discussion
> 
> aggregate( 'layername','max',"id")+1 
> thanks Giovanni
> 
> We need of course a more user friendly way to allow users have
> incremental/serial ids in their shapefiles... 
> sure, e.g. a named preset expression, as previously suggested.
> all the best.

In master you can add UNIQUE and NOT NULL constraints to the field
from within QGIS. This will cause QGIS to automatically populate it
with a serial type value whenever a new feature is created.

Nyall

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