Use backtrace cleaner for dev mode exception page

1 files changed, 24 insertions, 8 deletions

diff --git a/activesupport/lib/active_support/backtrace_cleaner.rb b/activesupport/lib/active_support/backtrace_cleaner.rb
index 0e262c003e..6fab565646 100644
--- a/activesupport/lib/active_support/backtrace_cleaner.rb
+++ b/activesupport/lib/active_support/backtrace_cleaner.rb
@@ -9,7 +9,7 @@ module ActiveSupport
   # Example:
   #
   #   bc = BacktraceCleaner.new
-  #   bc.add_filter   { |line| line.gsub(Rails.root, '') } 
+  #   bc.add_filter   { |line| line.gsub(Rails.root, '') }
   #   bc.add_silencer { |line| line =~ /mongrel|rubygems/ }
   #   bc.clean(exception.backtrace) # will strip the Rails.root prefix and skip any lines from mongrel or rubygems
   #
@@ -18,10 +18,19 @@ module ActiveSupport
     def initialize
       @filters, @silencers = [], []
     end
-    
+
     # Returns the backtrace after all filters and silencers has been run against it. Filters run first, then silencers.
-    def clean(backtrace)
-      silence(filter(backtrace))
+    def clean(backtrace, kind = :silent)
+      filtered = filter(backtrace)
+
+      case kind
+      when :silent
+        silence(filtered)
+      when :noise
+        noise(filtered)
+      else
+        filtered
+      end
     end
 
     # Adds a filter from the block provided. Each line in the backtrace will be mapped against this filter.
@@ -51,21 +60,28 @@ module ActiveSupport
       @silencers = []
     end
 
-    
     private
       def filter(backtrace)
         @filters.each do |f|
           backtrace = backtrace.map { |line| f.call(line) }
         end
-        
+
         backtrace
       end
-      
+
       def silence(backtrace)
         @silencers.each do |s|
           backtrace = backtrace.reject { |line| s.call(line) }
         end
-        
+
+        backtrace
+      end
+
+      def noise(backtrace)
+        @silencers.each do |s|
+          backtrace = backtrace.select { |line| s.call(line) }
+        end
+
         backtrace
       end
   end