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Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/active_support_core_extensions.md | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index e6f2db2a2d..9fca3d585b 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -3720,6 +3720,27 @@ 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` + +Unpatched Marshal#load doesn't call constant_missing so in order to support ActiveSupport constant autoloading load is patched using alias_method_chain. + +The method accepts the same arguments as unpatched Marshal#load and the result of calling it will be the same. + +For example, ActiveSupport uses this method to read from cache(in FileStore): + +```ruby +File.open(file_name) { |f| Marshal.load(f) } +``` + +If Marshal#load didn't support constant autoloading then various caching stores wouldn't too. + +WARNING. If a IO (e.g. a file) is used as source it needs to respond to rewind (which a normal file does) because if an exception is raised calling the original Marshal#load the file will be exhausted. + +NOTE: Defined in `active_support/core_ext/marshal.rb`. + Extensions to `Logger` ---------------------- |