Question

I am trying to do what is described here:
http://freelancing-god.github.com/ts/en/geosearching.html

Except rather than having latitude and longitude columns on my model, I want to do:

class Post
  has_one :location, :as => :locationable
end

class User
  has_one :location, :as => :locationable
end

class Location
  belongs_to :locationable, :polymorphic => true
end

so that User and Post can both have location records set by locationable_type and locationable_id… So I did the following in my Post model:

define_index do
  has locationable(:id), :as => :locationable_id
  has "RADIANS(locations.lat)", :as => :latitude, :type => :float
  has "RADIANS(locations.lng)", :as => :longitude, :type => :float
end

but I get an Unknown column in ‘field list’ error…

What am I doing wrong?

Answer 1

I figured it out.. This line:

has locationable(:id), :as => :locationable_id

Was supposed to be forcing a join… but it couldn’t because there is no such thing as locationable for a post record.. It has_one location.. So it needed to be:

define_index do
  has location.locationable_id, :as => :locationable_id
  has "RADIANS(locations.lat)", :as => :latitude, :type => :float
  has "RADIANS(locations.lng)", :as => :longitude, :type => :float
end

and now it works.