Solved (sort of). I dug around until I
found https://github.com/datamapper/dm-validations/issues/51. Here's what
I did for a workaround:
class WeatherStation
include DataMapper::Resource
# property <name>, <type>
property :id, Serial
property :callsign, String
property :lat, Decimal, :precision => 9, :scale => 6
property :lng, Decimal, :precision => 9, :scale => 6
def self.process_station(callsign, lat, lng)
# workaround for https://github.com/datamapper/dm-validations/issues/51
lat1 = BigDecimal(lat.to_f.round(6).to_s)
lng1 = BigDecimal(lng.to_f.round(6).to_s)
WeatherStation.first_or_create({:callsign => callsign},
{:lat => lat1, :lng => lng1})
end
end
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