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Diffstat (limited to 'guides/source/active_support_core_extensions.md')
-rw-r--r-- | guides/source/active_support_core_extensions.md | 66 |
1 files changed, 3 insertions, 63 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md index ba839e1723..0fbd6ed7e1 100644 --- a/guides/source/active_support_core_extensions.md +++ b/guides/source/active_support_core_extensions.md @@ -1,4 +1,4 @@ -**DO NOT READ THIS FILE IN GITHUB, GUIDES ARE PUBLISHED IN http://guides.rubyonrails.org.** +**DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON http://guides.rubyonrails.org.** Active Support Core Extensions ============================== @@ -467,7 +467,7 @@ C.new(0, 1).instance_variable_names # => ["@x", "@y"] NOTE: Defined in `active_support/core_ext/object/instance_variables.rb`. -### Silencing Warnings, Streams, and Exceptions +### Silencing Warnings and Exceptions The methods `silence_warnings` and `enable_warnings` change the value of `$VERBOSE` accordingly for the duration of their block, and reset it afterwards: @@ -475,26 +475,10 @@ The methods `silence_warnings` and `enable_warnings` change the value of `$VERBO silence_warnings { Object.const_set "RAILS_DEFAULT_LOGGER", logger } ``` -You can silence any stream while a block runs with `silence_stream`: - -```ruby -silence_stream(STDOUT) do - # STDOUT is silent here -end -``` - -The `quietly` method addresses the common use case where you want to silence STDOUT and STDERR, even in subprocesses: - -```ruby -quietly { system 'bundle install' } -``` - -For example, the railties test suite uses that one in a few places to prevent command messages from being echoed intermixed with the progress status. - Silencing exceptions is also possible with `suppress`. This method receives an arbitrary number of exception classes. If an exception is raised during the execution of the block and is `kind_of?` any of the arguments, `suppress` captures it and returns silently. Otherwise the exception is reraised: ```ruby -# If the user is locked the increment is lost, no big deal. +# If the user is locked, the increment is lost, no big deal. suppress(ActiveRecord::StaleObjectError) do current_user.increment! :visits end @@ -3813,50 +3797,6 @@ WARNING. If the argument is an `IO` it needs to respond to `rewind` to be able t NOTE: Defined in `active_support/core_ext/marshal.rb`. -Extensions to `Logger` ----------------------- - -### `around_[level]` - -Takes two arguments, a `before_message` and `after_message` and calls the current level method on the `Logger` instance, passing in the `before_message`, then the specified message, then the `after_message`: - -```ruby -logger = Logger.new("log/development.log") -logger.around_info("before", "after") { |logger| logger.info("during") } -``` - -### `silence` - -Silences every log level lesser to the specified one for the duration of the given block. Log level orders are: debug, info, error and fatal. - -```ruby -logger = Logger.new("log/development.log") -logger.silence(Logger::INFO) do - logger.debug("In space, no one can hear you scream.") - logger.info("Scream all you want, small mailman!") -end -``` - -### `datetime_format=` - -Modifies the datetime format output by the formatter class associated with this logger. If the formatter class does not have a `datetime_format` method then this is ignored. - -```ruby -class Logger::FormatWithTime < Logger::Formatter - cattr_accessor(:datetime_format) { "%Y%m%d%H%m%S" } - - def self.call(severity, timestamp, progname, msg) - "#{timestamp.strftime(datetime_format)} -- #{String === msg ? msg : msg.inspect}\n" - end -end - -logger = Logger.new("log/development.log") -logger.formatter = Logger::FormatWithTime -logger.info("<- is the current time") -``` - -NOTE: Defined in `active_support/core_ext/logger.rb`. - Extensions to `NameError` ------------------------- |