gistfile1.rb

# Current Facets Support:
# 
# Single-model searches only
#

class Person < ActiveRecord::Base
  define_index do
    indexes state, :facet => true
    has year, :facet => true
    facet city
  end
end

# Use same arguments as #search method.
Person.facets "blah" #=>
# {
#   :state => {
#     "Victoria"            => 10,
#     "New South Wales"     => 5,
#     "Queensland"          => 4,
#     "Tasmania"            => 3,
#     "Northern Territory"  => 3
#   },
#   :year => {
#     2006 =>  5,
#     2007 =>  8,
#     2008 => 10,
#     2009 =>  2
#   },
#   :city => {
#     "Melbourne"     => 8,
#     "Bendigo"       => 2,
#     "Sydney"        => 4,
#     "Gosford"       => 1,
#     "Brisbane"      => 4,
#     "Launceston"    => 1,
#     "Hobart"        => 2,
#     "Darwin"        => 2,
#     "Alice Springs" => 1
#   }
# }

@facets = Person.facets("blah")
@facets.for(:state => "Victoria") #=>
# [
#   <#Person ..>,
#   <#Person ..>,
#   <#Person ..>,
#   <#Person ..>,
#   ...
# ]

# You can drill down by multiple facets at once, too:
@facets.for(:state => "Victoria", :city => "Melbourne")