Sunspot Solr Rails geosearch is failing with undefined method error -

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i'm new using sunspot gem. have installed , correctly indexing , querying. however, trying bound search parameters including geo search. database table indexed solr has latitude , longitude fields i'm unable geo-search working.

here's have in model:

  searchable     .     .     .     double :latitude, :as => "lat"     double :longitude, :as => "lon"     location (:location) { sunspot::util::coordinates.new(lat, lon) }   end

however when run rake task reindex fails following:

undefined method `lat' #<product:0x1076e6650>

i've tried:

latlon(:location){ sunspot::util::coordinates.new(lat, lon) }

and 

location(:location){ sunspot::util::coordinates.new(:latitude, :longitude) }

i've tried various different options such passing in :latitude , :longitude rather lat, lon seem running different errors each time.

i've got following gems installed: sunspot (2.0.0, 1.3.3, 1.2.1) sunspot_rails (1.3.3, 1.2.1) sunspot_solr (2.0.0)

any suggestions appreciated! in advance.

i figured out. here's correct way it:

searchable . . . double :latitude double :longitude location (:location) { sunspot::util::coordinates.new(latitude, longitude) } end

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