a6.rb

pg_search_scope :_expensive_search_with_coords, (lambda do |term, lat, lon|
	{
		query: term,
		against: { name: 'A' },
		associated_against: {
			city_aliases: { name: 'B' },
			region:       { name: 'C' },
			country:      { name: 'D' }
		},
		ignoring: :accents,
		ranked_by: self.complext_script(lat, lon),
		order_with_rank: 'pg_search_rank DESC'
	}
end) # end lambda. Ugly, I know :P

def self.complex_script(lat, lon)
	<<-SCRIPT
		:tsearch * log(GREATEST(CAST(population AS integer), 3))
				 * (3.0 ^ (CAST((point(latitude,longitude) <@> point(#{lat}, #{lon}))
				           AS numeric) + 1.0) ^ -0.1)
	SCRIPT