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# 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 HashWithIndifferentAccess < Hash
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
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 other_hash.with_indifferent_access
end
# Removes a specified key from the hash.
def delete(key)
super(convert_key(key))
end
def stringify_keys!; self end
def symbolize_keys!; self 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
value.with_indifferent_access
when Array
value.collect { |e| e.is_a?(Hash) ? e.with_indifferent_access : e }
else
value
end
end
end
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