add postgis geometry as valid column type

[staffanhedstrom]

This small pr simply also adds the PostGIS geometry type as a valid Type when creating a column.

table.AddColumn<Geometry>("geom");

Will now correctly create the type. Note that if the PostGIS extension is not enabled you will run into errors.

[mysticmind]

@staffanhedstrom Thanks for the PR. This would work but the solution to include PostGIS support is a bit involved and will require it to be done like an add-on plugin like what we do for NodaTime. I will liaise with @jeremydmiller on this and keep you posted.

Apart from Geometry, there is also Geography as well for PostGIS.

[staffanhedstrom]

Right, I had hoped that this was all that was necessary.

I am building an Event Sourcing project using Marten and using Weasel to build up projection tables. We are working with coordinates within a country so just being able to generate the geometry column is all I need and works very well for me.

[staffanhedstrom]

To support geography, I think this would do the trick.
{NpgsqlDbType.Geography, new NpgsqlTypeMapping(NpgsqlDbType.Geography, DbType.Object, "geography")},

Geometry and Geography uses the same type in the NetTopologySuite. Would not icluding typeof(Geometry) cause issues here?

[jeremydmiller]

I'm good with this as soon as the PR is green. I'm doing a weasel release for a bug fix and saw it.