Order by nearest - PostGIS, GeoRuby, spatial_adapter

Question

I\'m trying to do an order query that finds records nearest to the current_user.

I know the distance between the two points is: current_location.euclidean_distance

Answer 1

If you really want to find literally the 5 records nearest to the current_user, consider neighborhood search, which is supported by KNN index in PostGIS 2.0 (see '<->' operator):

SELECT * FROM your_table ORDER BY your_table.geom <-> ST_Geomfromtext(your point as wkt, 1000) LIMIT 5