diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/hash/keys.rb')
-rw-r--r-- | activesupport/lib/active_support/core_ext/hash/keys.rb | 37 |
1 files changed, 25 insertions, 12 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/keys.rb b/activesupport/lib/active_support/core_ext/hash/keys.rb index d8748b1138..be4d611ce7 100644 --- a/activesupport/lib/active_support/core_ext/hash/keys.rb +++ b/activesupport/lib/active_support/core_ext/hash/keys.rb @@ -1,10 +1,18 @@ class Hash # Return a new hash with all keys converted to strings. + # + # { :name => 'Rob', :years => '28' }.stringify_keys + # #=> { "name" => "Rob", "years" => "28" } def stringify_keys - dup.stringify_keys! + result = {} + keys.each do |key| + result[key.to_s] = self[key] + end + result end - # Destructively convert all keys to strings. + # Destructively convert all keys to strings. Same as + # +stringify_keys+, but modifies +self+. def stringify_keys! keys.each do |key| self[key.to_s] = delete(key) @@ -14,34 +22,39 @@ class Hash # 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" } def symbolize_keys - dup.symbolize_keys! + result = {} + keys.each do |key| + result[(key.to_sym rescue key)] = self[key] + end + result end + alias_method :to_options, :symbolize_keys # Destructively convert all keys to symbols, as long as they respond - # to +to_sym+. + # to +to_sym+. Same as +symbolize_keys+, but modifies +self+. def symbolize_keys! keys.each do |key| - self[(key.to_sym rescue key) || key] = delete(key) + self[(key.to_sym rescue key)] = delete(key) end self end - - alias_method :to_options, :symbolize_keys alias_method :to_options!, :symbolize_keys! # 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 + # { :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 def assert_valid_keys(*valid_keys) valid_keys.flatten! each_key do |k| - raise(ArgumentError, "Unknown key: #{k}") unless valid_keys.include?(k) + raise ArgumentError.new("Unknown key: #{k}") unless valid_keys.include?(k) end end end |