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class Hash
# Return a new hash with all keys converted to strings.
def stringify_keys
dup.stringify_keys!
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, as long as
# they respond to +to_sym+.
def symbolize_keys
dup.symbolize_keys!
end
# Destructively convert all keys to symbols, as long as they respond
# to +to_sym+.
def symbolize_keys!
keys.each do |key|
self[(key.to_sym rescue key) || 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(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
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