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(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
# File lib/active_support/core_ext/hash/keys.rb, line 45 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
Return a new hash with all keys converted to strings.
# 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
Destructively convert all keys to strings.
# File lib/active_support/core_ext/hash/keys.rb, line 14 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.
# File lib/active_support/core_ext/hash/keys.rb, line 22 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.
# File lib/active_support/core_ext/hash/keys.rb, line 30 def symbolize_keys! self.replace(self.symbolize_keys) end
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