Add ActiveSupport::Logger#silence that works the same as the old Logger#silence extension

activesupport/CHANGELOG.md

 ## Rails 4.0.0 (unreleased) ##
 
+*   Add ActiveSupport::Logger#silence that works the same as the old Logger#silence extension.
+
+    *DHH*
+
 *   Remove surrogate unicode character encoding from `ActiveSupport::JSON.encode`
     The encoding scheme was broken for unicode characters outside the basic multilingual plane;
     since json is assumed to be `UTF-8`, and we already force the encoding to `UTF-8`,

activesupport/lib/active_support/core_ext/logger.rb

 require 'active_support/core_ext/class/attribute_accessors'
 require 'active_support/deprecation'
+require 'active_support/logger_silence'
 
 ActiveSupport::Deprecation.warn 'this file is deprecated and will be removed'
 
@@ -31,27 +32,9 @@ def around_#{level}(before_message, after_message)  # def around_debug(before_me
 #
 #   logger.datetime_format = "%Y-%m-%d"
 #
-# Note: This logger is deprecated in favor of ActiveSupport::Logger
+# Note: This logger is deprecated in favor of ActiveSupport::BufferedLogger
 class Logger
-  ##
-  # :singleton-method:
-  # Set to false to disable the silencer
-  cattr_accessor :silencer
-  self.silencer = true
-
-  # Silences the logger for the duration of the block.
-  def silence(temporary_level = Logger::ERROR)
-    if silencer
-      begin
-        old_logger_level, self.level = level, temporary_level
-        yield self
-      ensure
-        self.level = old_logger_level
-      end
-    else
-      yield self
-    end
-  end
+  include LoggerSilence
 
   alias :old_datetime_format= :datetime_format=
   # Logging date-time format (string passed to +strftime+). Ignored if the formatter

activesupport/lib/active_support/logger.rb

+require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/logger_silence'
 require 'logger'
 
 module ActiveSupport
   class Logger < ::Logger
+    include LoggerSilence
+
     # Broadcasts logs to multiple loggers.
     def self.broadcast(logger) # :nodoc:
       Module.new do

activesupport/lib/active_support/logger_silence.rb

+require 'active_support/concern'
+
+module LoggerSilence
+  extend ActiveSupport::Concern
+  
+  included do
+    cattr_accessor :silencer
+    self.silencer = true
+  end
+
+  # Silences the logger for the duration of the block.
+  def silence(temporary_level = Logger::ERROR)
+    if silencer
+      begin
+        old_logger_level, self.level = level, temporary_level
+        yield self
+      ensure
+        self.level = old_logger_level
+      end
+    else
+      yield self
+    end
+  end
+end
\ No newline at end of file

activesupport/test/logger_test.rb

@@ -120,4 +120,14 @@ def test_buffer_multibyte
     byte_string.force_encoding("ASCII-8BIT")
     assert byte_string.include?(BYTE_STRING)
   end
+  
+  def test_silencing_everything_but_errors
+    @logger.silence do
+      @logger.debug "NOT THERE"
+      @logger.error "THIS IS HERE"
+    end
+    
+    assert !@output.string.include?("NOT THERE")
+    assert @output.string.include?("THIS IS HERE")
+  end
 end