-module ActiveSupport #:nodoc:
- module CoreExtensions #:nodoc:
- module Hash #:nodoc:
- module Keys
- # Return a new hash with all keys converted to strings.
- def stringify_keys
- inject({}) do |options, (key, value)|
- options[key.to_s] = value
- options
- end
- end
-
- # Destructively convert all keys to strings.
- def stringify_keys!
- keys.each do |key|
- self[key.to_s] = delete(key)
- end
- self
- end
-
- # Return a new hash with all keys converted to symbols.
- def symbolize_keys
- inject({}) do |options, (key, value)|
- options[(key.to_sym rescue key) || key] = value
- options
- end
- end
-
- # Destructively convert all keys to symbols.
- def symbolize_keys!
- self.replace(self.symbolize_keys)
- 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(s): years"
- # { :name => "Rob", :age => "28" }.assert_valid_keys("name", "age") # => raises "ArgumentError: Unknown key(s): name, age"
- # { :name => "Rob", :age => "28" }.assert_valid_keys(:name, :age) # => passes, raises nothing
- def assert_valid_keys(*valid_keys)
- unknown_keys = keys - [valid_keys].flatten
- raise(ArgumentError, "Unknown key(s): #{unknown_keys.join(", ")}") unless unknown_keys.empty?
- end
- end
- end
- end
-end