diff options
Diffstat (limited to 'activesupport/lib/active_support/core_ext/date/freeze.rb')
-rw-r--r-- | activesupport/lib/active_support/core_ext/date/freeze.rb | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/date/freeze.rb b/activesupport/lib/active_support/core_ext/date/freeze.rb new file mode 100644 index 0000000000..4edd715ba2 --- /dev/null +++ b/activesupport/lib/active_support/core_ext/date/freeze.rb @@ -0,0 +1,31 @@ +# Date memoizes some instance methods using metaprogramming to wrap +# the methods with one that caches the result in an instance variable. +# +# If a Date is frozen but the memoized method hasn't been called, the +# first call will result in a frozen object error since the memo +# instance variable is uninitialized. +# +# Work around by eagerly memoizing before freezing. +# +# Ruby 1.9 uses a preinitialized instance variable so it's unaffected. +# This hack is as close as we can get to feature detection: +if RUBY_VERSION < '1.9' + require 'date' + begin + ::Date.today.freeze.jd + rescue => frozen_object_error + if frozen_object_error.message =~ /frozen/ + class Date #:nodoc: + def freeze + self.class.private_instance_methods(false).each do |m| + if m.to_s =~ /\A__\d+__\Z/ + instance_variable_set(:"@#{m}", [send(m)]) + end + end + + super + end + end + end + end +end |