rgeo/activerecord-postgis-adapter — pull request #143 by daveheitzman (2014-10-17 17:11:58+00:00)
Title: allow postgis 1.5 with Active Record 4.1.x

In AR 4.1.4 columns still get instantiated as PostgreSQLColumn .

If #spatial? is implemented in this class then you can use this gem if
your postgis server is still on 1.5 .

class SpatialColumn < ConnectionAdapters::PostgreSQLColumn # :nodoc:
...
end