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satoshin2071/gist:5243543

Created March 26, 2013 06:34
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ActiveRecordでgroup Byしてカウントをして、カウント数でorderする via 酒と泪とRubyとRailsと
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gistfile1.rb
#===sample
#
#MP3プレイヤーのProductのmaker名をレコード数の多い順に並べてその結果のハッシュのkeyであるmaker名を配列として取得
#
Product.where(category: "MP3 Player").group(:maker).order('count_maker desc').count('maker').keys
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