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module Hashie
module Extensions
module Mash
# Overrides the indifferent access of a Mash to keep keys in the
# original format given to the Mash.
#
# @example
# class KeepingMash < Hashie::Mash
# include Hashie::Extensions::Mash::KeepOriginalKeys
# end
#
# mash = KeepingMash.new(:symbol_key => :symbol, 'string_key' => 'string')
# mash.to_hash #=> { :symbol_key => :symbol, 'string_key' => 'string' }
# mash['string_key'] == mash[:string_key] #=> true
# mash[:symbol_key] == mash['symbol_key'] #=> true
module KeepOriginalKeys
def self.included(descendant)
raise ArgumentError, "#{descendant} is not a kind of Hashie::Mash" unless descendant <= Hashie::Mash
end
private
# Converts the key when necessary to access the correct Mash key.
#
# @param [Object, String, Symbol] key the key to access.
# @return [Object] the value assigned to the key.
def convert_key(key)
if regular_key?(key)
key
elsif (converted_key = __convert(key)) && regular_key?(converted_key)
converted_key
else
key
end
end
# Converts symbol/string keys to their alternative formats, but leaves
# other keys alone.
#
# @param [Object, String, Symbol] key the key to convert.
# @return [Object, String, Symbol] the converted key.
def __convert(key)
case key
when Symbol then key.to_s
when String then key.to_sym
else key
end
end
end
end
end
end
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