[QGIS-Developer] set and export FID with OGR provider

[Even Rouault]

On mardi 10 octobre 2017 12:20:48 CEST G. Allegri wrote:
> On second thought maybe this flag could be a creation option os the OGR
> GeoJSON driver. The driver writes the "id" property only if a FID is set.
> Maybe a SET_ID flag (or something more miningful) could force the driver
> creating the "id" with a sequential integer even if a FID is not set for
> the features.
> What's your opinion? In case I will open a ticket for OGR.

I don't think this control should be done at the driver level. I'd say that if the GeoJSON 
CreateFeature() API is called with a feature with a FID set, it should write it.
The logic to decide whether you create a new sequence, re-use source FID or don't set a 
FID at all belongs to the upper layers (in that case, QGIS. or ogr2ogr which has -
preserve_fid or -unsetFid flags).

Even

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