Rails - Apr 2009 - acts_as_mappable :through relationship is not working

Hello-
I have two models (User and Locations). One user can have  multiple
locations (home, office etc..) The location table has the lat and
lngs.

class User < ActiveRecord::Base
     has_many :locations
     acts_as_mappable :through => :locations

class Location < ActiveRecord::Base
    belongs_to :user
    acts_as_mappable

Now, when I do User.find_within(500. :origin => ..), It fails with the
following error:
                Mysql::Error: Unknown column ''users.lat'' in
''field
list'':

So, it seems that the :through relationship is not working. Can
someone pelase help me.

thanks
-John

John,

acts_as_mappable is not an association, it''s a custom macro and it
doesn''t support :through option.

So remove it from the User model. And to find all users near some
point use something like:

  Location.find_within(500. :origin => ..., :include => :user).map
(&:user).uniq

Dmitry