Question

I’m getting the following error when I try to create a new venue that is location aware.

ActiveRecord::StatementInvalid: PG::Error: ERROR:  new row for relation "venues" violates check constraint "enforce_srid_latlon"

This is the method I follow to recreate the error.

v = Venue.create(:latlon => "POINT (43.245332 -85.4352332)")
v.save

I did notice that in my migrations, I did not set the :geographic => true property for t.point :latlon. Could that be what’s causing my problems? If so, how do I set that flag to true on a column that already contains data?

Answer 1

The simplest way to set your SRID is to prefix the WKT into EWKT (extended well-known text):

v = Venue.create(:latlon => "SRID=4326;POINT (43.245332 -85.4352332)")

I’m using SRID=4326, since it looks like you have WGS84 latitude/longitude coordinates, which is typical.