class Hash
grabbed from activesupport-4.0.1
Public Instance Methods
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.
{ 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
# File lib/unbind/core_ext/hash/keys.rb, line 69 def assert_valid_keys(*valid_keys) valid_keys.flatten! each_key do |k| raise ArgumentError.new("Unknown key: #{k}") unless valid_keys.include?(k) end end
Return a new hash with all keys converted to strings. This includes the keys from the root hash and from all nested hashes.
hash = { person: { name: 'Rob', age: '28' } } hash.deep_stringify_keys # => { "person" => { "name" => "Rob", "age" => "28" } }
# File lib/unbind/core_ext/hash/keys.rb, line 111 def deep_stringify_keys deep_transform_keys{ |key| key.to_s } end
Destructively convert all keys to strings. This includes the keys from the root hash and from all nested hashes.
# File lib/unbind/core_ext/hash/keys.rb, line 118 def deep_stringify_keys! deep_transform_keys!{ |key| key.to_s } end
Return a new hash with all keys converted to symbols, as long as they respond to to_sym
. This includes the keys from the root hash and from all nested hashes.
hash = { 'person' => { 'name' => 'Rob', 'age' => '28' } } hash.deep_symbolize_keys # => { person: { name: "Rob", age: "28" } }
# File lib/unbind/core_ext/hash/keys.rb, line 130 def deep_symbolize_keys deep_transform_keys{ |key| key.to_sym rescue key } end
Destructively convert all keys to symbols, as long as they respond to to_sym
. This includes the keys from the root hash and from all nested hashes.
# File lib/unbind/core_ext/hash/keys.rb, line 137 def deep_symbolize_keys! deep_transform_keys!{ |key| key.to_sym rescue key } end
Return a new hash with all keys converted by the block operation. This includes the keys from the root hash and from all nested hashes.
hash = { person: { name: 'Rob', age: '28' } } hash.deep_transform_keys{ |key| key.to_s.upcase } # => { "PERSON" => { "NAME" => "Rob", "AGE" => "28" } }
# File lib/unbind/core_ext/hash/keys.rb, line 84 def deep_transform_keys(&block) result = {} each do |key, value| result[yield(key)] = value.is_a?(Hash) ? value.deep_transform_keys(&block) : value end result end
Destructively convert all keys by using the block operation. This includes the keys from the root hash and from all nested hashes.
# File lib/unbind/core_ext/hash/keys.rb, line 95 def deep_transform_keys!(&block) keys.each do |key| value = delete(key) self[yield(key)] = value.is_a?(Hash) ? value.deep_transform_keys!(&block) : value end self end
Return a new hash with all keys converted to strings.
hash = { name: 'Rob', age: '28' } hash.stringify_keys #=> { "name" => "Rob", "age" => "28" }
# File lib/unbind/core_ext/hash/keys.rb, line 33 def stringify_keys transform_keys{ |key| key.to_s } end
Destructively convert all keys to strings. Same as stringify_keys
, but modifies self
.
# File lib/unbind/core_ext/hash/keys.rb, line 39 def stringify_keys! transform_keys!{ |key| key.to_s } end
Return a new hash with all keys converted to symbols, as long as they respond to to_sym
.
hash = { 'name' => 'Rob', 'age' => '28' } hash.symbolize_keys #=> { name: "Rob", age: "28" }
# File lib/unbind/core_ext/hash/keys.rb, line 50 def symbolize_keys transform_keys{ |key| key.to_sym rescue key } end
Destructively convert all keys to symbols, as long as they respond to to_sym
. Same as symbolize_keys
, but modifies self
.
# File lib/unbind/core_ext/hash/keys.rb, line 57 def symbolize_keys! transform_keys!{ |key| key.to_sym rescue key } end
Return a new hash with all keys converted using the block operation.
hash = { name: 'Rob', age: '28' } hash.transform_keys{ |key| key.to_s.upcase } # => { "NAME" => "Rob", "AGE" => "28" }
# File lib/unbind/core_ext/hash/keys.rb, line 10 def transform_keys result = {} each_key do |key| result[yield(key)] = self[key] end result end
Destructively convert all keys using the block operations. Same as transform_keys
but modifies self
.
# File lib/unbind/core_ext/hash/keys.rb, line 20 def transform_keys! keys.each do |key| self[yield(key)] = delete(key) end self end