openlayers 2 - Why does Geoserver not serve my primary key/ id?

I have a postgres/postgis table with the columns:

• gid [PK] serial NOT NULL,


• geom geometry(MultiPolygon,900913),


• crop text

My layer in Geoserver however only shows me the feature types "geom" and "crop", the "gid" is not listed. Problem is, I need the gid to update data of a particular (the selected) polygon.

Is there a way to get the gid? If not, how do you bypass this problem?

Answer

You must to check "expose primary key" in your datastore configuration