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Contents
module MoreCoreExtensions
module StableSorting
# Sorts an Array of Hashes by specific columns.
#
# Rows are sorted by +col_names+, if given, otherwise by the given block.
# The +order+ parameter can be given :ascending or :descending and
# defaults to :ascending.
#
# Note:
# - Strings are sorted case-insensitively
# - nil values are sorted last
# - Boolean values are sorted alphabetically (i.e. false then true)
#
# [
# {:col1 => 'b', :col2 => 2},
# {:col1 => 'b', :col2 => 1},
# {:col1 => 'A', :col2 => 1}
# ].tabular_sort([:col1, :col2])
#
# # => [
# # {:col1 => 'A', :col2 => 1},
# # {:col1 => 'b', :col2 => 1},
# # {:col1 => 'b', :col2 => 2}
# # ]
def tabular_sort(col_names = nil, order = nil, &block)
# stabilizer is needed because of
# http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/170565
stabilizer = 0
nil_rows, sortable =
partition do |r|
Array(col_names).any? { |c| r[c].nil? }
end
data_array =
if col_names
sortable.sort_by do |r|
stabilizer += 1
[Array(col_names).map do |col|
val = r[col]
val = val.downcase if val.kind_of?(String)
val = val.to_s if val.kind_of?(FalseClass) || val.kind_of?(TrueClass)
val
end, stabilizer]
end
else
sortable.sort_by(&block)
end.to_a
data_array += nil_rows
data_array.reverse! if order == :descending
data_array
end
end
end
Array.send(:include, MoreCoreExtensions::StableSorting)
Version data entries
8 entries across 8 versions & 1 rubygems