This class has dubious semantics and we only have it so that people can write params instead of params and they get the same value for both keys.

Methods
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Class Public methods
new(constructor = {})
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 6
def initialize(constructor = {})
  if constructor.is_a?(Hash)
    super()
    update(constructor)
  else
    super(constructor)
  end
end
Instance Public methods
[]=(key, value)

Assigns a new value to the hash:

hash = HashWithIndifferentAccess.new
hash[:key] = "value"
Also aliased as: regular_writer
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 31
def []=(key, value)
  regular_writer(convert_key(key), convert_value(value))
end
default(key = nil)
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 15
def default(key = nil)
  if key.is_a?(Symbol) && include?(key = key.to_s)
    self[key]
  else
    super
  end
end
delete(key)

Removes a specified key from the hash.

# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 101
def delete(key)
  super(convert_key(key))
end
dup()

Returns an exact copy of the hash.

# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 84
def dup
  HashWithIndifferentAccess.new(self)
end
fetch(key, *extras)

Fetches the value for the specified key, same as doing hash

# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 68
def fetch(key, *extras)
  super(convert_key(key), *extras)
end
has_key?(key)
include?(key)
key?(key)

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
Also aliased as: include?, has_key?, member?
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 59
def key?(key)
  super(convert_key(key))
end
member?(key)
merge(hash)

Merges the instantized and the specified hashes together, giving precedence to the values from the second hash Does not overwrite the existing hash.

# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 90
def merge(hash)
  self.dup.update(hash)
end
merge!(other_hash)
regular_update(other_hash)
regular_writer(key, value)
reverse_merge(other_hash)

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.

# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 96
def reverse_merge(other_hash)
  super other_hash.with_indifferent_access
end
stringify_keys!()
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 105
def stringify_keys!; self end
symbolize_keys!()
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 106
def symbolize_keys!; self end
to_hash()

Convert to a Hash with String keys.

# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 110
def to_hash
  Hash.new(default).merge(self)
end
to_options!()
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 107
def to_options!; self end
update(other_hash)

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!"}
Also aliased as: regular_update, merge!
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 45
def update(other_hash)
  other_hash.each_pair { |key, value| regular_writer(convert_key(key), convert_value(value)) }
  self
end
values_at(*indices)

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"]
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 79
def values_at(*indices)
  indices.collect {|key| self[convert_key(key)]}
end
Instance Protected methods
convert_key(key)
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 115
def convert_key(key)
  key.kind_of?(Symbol) ? key.to_s : key
end
convert_value(value)
# File activesupport/lib/active_support/core_ext/hash/indifferent_access.rb, line 119
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