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module Enumerable #:nodoc:
# Collect an enumerable into sets, grouped by the result of a block. Useful,
# for example, for grouping records by date.
#
# e.g.
#
# latest_transcripts.group_by(&:day).each do |day, transcripts|
# p "#{day} -> #{transcripts.map(&:class) * ', '}"
# end
# "2006-03-01 -> Transcript"
# "2006-02-28 -> Transcript"
# "2006-02-27 -> Transcript, Transcript"
# "2006-02-26 -> Transcript, Transcript"
# "2006-02-25 -> Transcript"
# "2006-02-24 -> Transcript, Transcript"
# "2006-02-23 -> Transcript"
def group_by
inject({}) do |groups, element|
(groups[yield(element)] ||= []) << element
groups
end
end
end
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