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certainty/gist:3135595

Created July 18, 2012 11:06
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there you go
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gistfile1.rb
your_map = @users.inject({}) do |m,u|
duplicates = @users.select{ |u2| u.id != u2.id && u.email == u2.email }
(m[u.email] ||= []).concat(duplicates) unless duplicates.empty?
m
end
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