Class: Hash

Inherits:
Object
  • Object
show all
Defined in:
lib/core_ext/hash/keys.rb

Instance Method Summary collapse

Instance Method Details

#assert_valid_keys(*valid_keys) ⇒ Object

Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch. Note that keys are NOT treated indifferently, meaning if you use strings for keys but assert symbols as keys, this will fail.

Examples

{ :name => "Rob", :years => "28" }.assert_valid_keys(:name, :age) # => raises "ArgumentError: Unknown key: years"
{ :name => "Rob", :age => "28" }.assert_valid_keys("name", "age") # => raises "ArgumentError: Unknown key: name"
{ :name => "Rob", :age => "28" }.assert_valid_keys(:name, :age) # => passes, raises nothing



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# File 'lib/core_ext/hash/keys.rb', line 45

def assert_valid_keys(*valid_keys)
  valid_keys.flatten!
  each_key do |k|
    raise(ArgumentError, "Unknown key: #{k}") unless valid_keys.include?(k)
  end
end

#stringify_keys ⇒ Object

Return a new hash with all keys converted to strings.

{ :name => 'Rob', :years => '28' }.stringify_keys
#=> { "name" => "Rob", "years" => "28" }



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

def stringify_keys
  dup.stringify_keys!
end

#stringify_keys! ⇒ Object

Destructively convert all keys to strings. Same as stringify_keys, but modifies self.



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# File 'lib/core_ext/hash/keys.rb', line 12

def stringify_keys!
  keys.each do |key|
    self[key.to_s] = delete(key)
  end
  self
end

#symbolize_keys ⇒ Object

Return a new hash with all keys converted to symbols, as long as they respond to to_sym.

{ 'name' => 'Rob', 'years' => '28' }.symbolize_keys
#=> { :name => "Rob", :years => "28" }



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# File 'lib/core_ext/hash/keys.rb', line 24

def symbolize_keys
  dup.symbolize_keys!
end

#symbolize_keys! ⇒ Object

Destructively convert all keys to symbols, as long as they respond to to_sym. Same as symbolize_keys, but modifies self.



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# File 'lib/core_ext/hash/keys.rb', line 30

def symbolize_keys!
  keys.each do |key|
    self[(key.to_sym rescue key) || key] = delete(key)
  end
  self
end