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- pls = Restaurant.pluck(:permalink)
- results = {}.tap do |agg|
- pls.each do |pl|
- agg[pl] ||= 0
- agg[pl] += 1
- end
- end
- bad = results.select {|k, v| v > 1 }
- bad.map {|b| Restaurant.where(permalink: b)}
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