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# This implementation is HODEL-HASH-9600 compliant
class HashWithIndifferentAccess < Hash
def initialize(constructor = {})
if constructor.is_a?(Hash)
super()
update(constructor)
else
super(constructor)
end
end
%w( [] []= fetch store delete has_key? include? key? member? ).each do |method_name|
class_eval %(
def #{method_name}(key, *args)
super(convert_key(key), *args.map { |arg| convert_value(arg) })
end
)
end
#define_method method_name, &convert_key_and_hashes_and_call_super }
%w( == eql? replace initialize_copy merge merge! update ).each do |method_name|
class_eval %(
def #{method_name}(other_hash)
super(convert_hash(other_hash))
end
)
end
def invert
self.class.new.replace(super)
end
def values_at(*keys)
super *keys.map{ |key| convert_key(key) }
end
protected
def convert_key(key)
key.kind_of?(Symbol) ? key.to_s : key
end
def convert_value(value)
value.is_a?(Hash) ? value.with_indifferent_access : value
end
def convert_hash(hash)
hash.is_a?(Hash) ? hash.inject({}){ |h,(k,v)| h[convert_key(k)] = convert_value(v); h } : hash
end
end
module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Hash #:nodoc:
module IndifferentAccess #:nodoc:
def with_indifferent_access
HashWithIndifferentAccess.new(self)
end
end
end
end
end
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