JezK
Edit File: hash_with_indifferent_access.rb
# Note: HashWithIndifferentAccess is so commonly used # that we always need to make sure that the driver works # with it. #require File.join(File.dirname(__FILE__), 'keys.rb') # This class has dubious semantics and we only have it so that # people can write params[:key] instead of params['key'] # and they get the same value for both keys. class Hash # Return a new hash with all keys converted to strings. def stringify_keys dup.stringify_keys! end # Destructively convert all keys to strings. def stringify_keys! keys.each do |key| self[key.to_s] = delete(key) end self end # Return a new hash with all keys converted to symbols, as long as # they respond to +to_sym+. def symbolize_keys dup.symbolize_keys! end # Destructively convert all keys to symbols, as long as they respond # to +to_sym+. def symbolize_keys! keys.each do |key| self[(key.to_sym rescue key) || key] = delete(key) end self end alias_method :to_options, :symbolize_keys #alias_method :to_options!, :symbolize_keys! end module ActiveSupport class HashWithIndifferentAccess < Hash def extractable_options? true end def initialize(constructor = {}) if constructor.is_a?(Hash) super() update(constructor) else super(constructor) end end def default(key = nil) if key.is_a?(Symbol) && include?(key = key.to_s) self[key] else super end end def self.new_from_hash_copying_default(hash) ActiveSupport::HashWithIndifferentAccess.new(hash).tap do |new_hash| new_hash.default = hash.default end end alias_method :regular_writer, :[]= unless method_defined?(:regular_writer) alias_method :regular_update, :update unless method_defined?(:regular_update) # Assigns a new value to the hash: # # hash = HashWithIndifferentAccess.new # hash[:key] = "value" # def []=(key, value) regular_writer(convert_key(key), convert_value(value)) end # Updates the instantized hash with values from the second: # # hash_1 = HashWithIndifferentAccess.new # hash_1[:key] = "value" # # hash_2 = HashWithIndifferentAccess.new # hash_2[:key] = "New Value!" # # hash_1.update(hash_2) # => {"key"=>"New Value!"} # def update(other_hash) other_hash.each_pair { |key, value| regular_writer(convert_key(key), convert_value(value)) } self end alias_method :merge!, :update # Checks the hash for a key matching the argument passed in: # # hash = HashWithIndifferentAccess.new # hash["key"] = "value" # hash.key? :key # => true # hash.key? "key" # => true # def key?(key) super(convert_key(key)) end alias_method :include?, :key? alias_method :has_key?, :key? alias_method :member?, :key? # Fetches the value for the specified key, same as doing hash[key] def fetch(key, *extras) super(convert_key(key), *extras) end # Returns an array of the values at the specified indices: # # hash = HashWithIndifferentAccess.new # hash[:a] = "x" # hash[:b] = "y" # hash.values_at("a", "b") # => ["x", "y"] # def values_at(*indices) indices.collect {|key| self[convert_key(key)]} end # Returns an exact copy of the hash. def dup HashWithIndifferentAccess.new(self) end # Merges the instantized and the specified hashes together, giving precedence to the values from the second hash # Does not overwrite the existing hash. def merge(hash) self.dup.update(hash) end # Performs the opposite of merge, with the keys and values from the first hash taking precedence over the second. # This overloaded definition prevents returning a regular hash, if reverse_merge is called on a HashWithDifferentAccess. def reverse_merge(other_hash) super self.class.new_from_hash_copying_default(other_hash) end def reverse_merge!(other_hash) replace(reverse_merge( other_hash )) end # Removes a specified key from the hash. def delete(key) super(convert_key(key)) end def stringify_keys!; self end def stringify_keys; dup end def symbolize_keys; to_hash.symbolize_keys end def to_options!; self end # Convert to a Hash with String keys. def to_hash Hash.new(default).merge!(self) end protected def convert_key(key) key.kind_of?(Symbol) ? key.to_s : key end def convert_value(value) case value when Hash self.class.new_from_hash_copying_default(value) when Array value.collect { |e| e.is_a?(Hash) ? self.class.new_from_hash_copying_default(e) : e } else value end end end end HashWithIndifferentAccess = ActiveSupport::HashWithIndifferentAccess