diff options
Diffstat (limited to 'guides/source/active_support_core_extensions.md')
| -rw-r--r-- | guides/source/active_support_core_extensions.md | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index 2baf8c2515..775da2a85c 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -2067,14 +2067,6 @@ The sum of an empty receiver can be customized in this form as well: [].sum(1) {|n| n**3} # => 1 ``` -The method `ActiveRecord::Observer#observed_subclasses` for example is implemented this way: - -```ruby -def observed_subclasses - observed_classes.sum([]) { |klass| klass.send(:subclasses) } -end -``` - NOTE: Defined in `active_support/core_ext/enumerable.rb`. ### `index_by` @@ -3728,6 +3720,25 @@ The auxiliary file is written in a standard directory for temporary files, but y NOTE: Defined in `active_support/core_ext/file/atomic.rb`. +Extensions to `Marshal` +----------------------- + +### `load` + +Active Support adds constant autoloading support to `load`. + +For example, the file cache store deserializes this way: + +```ruby +File.open(file_name) { |f| Marshal.load(f) } +``` + +If the cached data refers to a constant that is unknown at that point, the autoloading mechanism is triggered and if it succeeds the deserialization is retried transparently. + +WARNING. If the argument is an `IO` it needs to respond to `rewind` to be able to retry. Regular files respond to `rewind`. + +NOTE: Defined in `active_support/core_ext/marshal.rb`. + Extensions to `Logger` ---------------------- |