Help using near with maxDistance in a model. Mongo::OperationFailure: geo values have to be numbers:

[NickW]

I'm trying to add a model method to abstract radius searches within a
given distance and have them ordered by distance. I must be doing
something silly in my query syntax.

>> Site.nearest([-122.0,44.0],200)
>Mongo::OperationFailure: geo values have to be numbers: {$maxDistance: 200, $near: [ -122.0, 44.0 ] }


class Site
include MongoMapper::Document

key :id, Integer
key :name, String
key :location, Array
ensure_index [[:location, '2d']]


def self.nearest(center_point, range)
where(:location => {'$near' => center_point, '$maxDistance' =>
range}).all
end

end

[Brian Hempel]

I'm guessing it's actually a data problem or index problem, your query looks correct.

See: http://www.mongodb.org/display/DOCS/Geospatial+Indexing ... 200 may be too large.

"By default, the index assumes you are indexing longitude/latitude and is thus configured for a [-180..180) value range"
"... $maxDistance : 10. The distance unit is the same as in your coordinate system, and so this query looks for points up to 10 meters away."

Brian

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[Jon Kern]

what happens if you get rid of max distance part of the query?

jon

blog: http://technicaldebt.com
twitter: http://twitter.com/JonKernPA

NickW said the following on 4/5/12 11:05 AM: