Module: ActiveSupport::CoreExtensions::Hash::Keys

Included in:
Hash
Defined in:
lib/active_support/core_ext/hash/keys.rb

Instance Method Summary collapse

Instance Method Details

#assert_valid_keys(valid_keys) ⇒ Object

Raises:

  • (ArgumentError)

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# File 'lib/active_support/core_ext/hash/keys.rb', line 46

def assert_valid_keys(valid_keys)
  unknown_keys = keys - valid_keys
  raise(ArgumentError, "Unknown key(s): #{unknown_keys.join(", ")}") unless unknown_keys.empty?
end

#stringify_keysObject

Return a new hash with all keys converted to strings.


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# File 'lib/active_support/core_ext/hash/keys.rb', line 6

def stringify_keys
  inject({}) do |options, (key, value)|
    options[key.to_s] = value
    options
  end
end

#stringify_keys!Object

Destructively convert all keys to strings.


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# File 'lib/active_support/core_ext/hash/keys.rb', line 14

def stringify_keys!
  keys.each do |key|
    unless key.class.to_s == "String" # weird hack to make the tests run when string_ext_test.rb is also running
      self[key.to_s] = self[key]
      delete(key)
    end
  end
  self
end

#symbolize_keysObject Also known as: to_options

Return a new hash with all keys converted to symbols.


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# File 'lib/active_support/core_ext/hash/keys.rb', line 25

def symbolize_keys
  inject({}) do |options, (key, value)|
    options[key.to_sym] = value
    options
  end
end

#symbolize_keys!Object Also known as: to_options!

Destructively convert all keys to symbols.


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# File 'lib/active_support/core_ext/hash/keys.rb', line 33

def symbolize_keys!
  keys.each do |key|
    unless key.is_a?(Symbol)
      self[key.to_sym] = self[key]
      delete(key)
    end
  end
  self
end