diff --git a/app/helpers/notices_helper.rb b/app/helpers/notices_helper.rb
index 017f0a6..6bd5073 100644
--- a/app/helpers/notices_helper.rb
+++ b/app/helpers/notices_helper.rb
@@ -1,16 +1,12 @@
 # encoding: utf-8
 module NoticesHelper
-  def in_app_backtrace_line?(line)
-    !!(line['file'] =~ %r{^\[PROJECT_ROOT\]/(?!(vendor))})
-  end
-
   def notice_atom_summary(notice)
     render "notices/atom_entry.html.haml", :notice => notice
   end
 
   def link_to_source_file(app, line, &block)
     text = capture_haml(&block)
-    if in_app_backtrace_line?(line)
+    if line.in_app?
       return link_to_github(app, line, text) if app.github_repo?
       return link_to_bitbucket(app, line, text) if app.bitbucket_repo?
       if app.issue_tracker && app.issue_tracker.respond_to?(:url_to_file)
@@ -48,7 +44,7 @@ module NoticesHelper
   def grouped_lines(lines)
     line_groups = []
     lines.each do |line|
-      in_app = in_app_backtrace_line?(line)
+      in_app = line.in_app?
       if line_groups.last && line_groups.last[0] == in_app
         line_groups.last[1] << line
       else
diff --git a/app/models/backtrace_line.rb b/app/models/backtrace_line.rb
index e1e71d9..e74fa1c 100644
--- a/app/models/backtrace_line.rb
+++ b/app/models/backtrace_line.rb
@@ -1,5 +1,6 @@
 class BacktraceLine
   include Mongoid::Document
+  IN_APP_REGEXP = %r{^\[PROJECT_ROOT\]\/(?!(vendor))}
 
   field :number, :type => Integer
   field :file
@@ -7,8 +8,18 @@ class BacktraceLine
 
   embedded_in :backtrace
 
+  scope :in_app, where(:file => IN_APP_REGEXP)
+
   def fingerprint
     [number, file, method].join
   end
+
+  def to_s
+    "#{file}:#{number}"
+  end
+
+  def in_app?
+    !!(file =~ IN_APP_REGEXP)
+  end
 end
 
diff --git a/app/models/notice.rb b/app/models/notice.rb
index f848f2f..29c30b5 100644
--- a/app/models/notice.rb
+++ b/app/models/notice.rb
@@ -91,9 +91,8 @@ class Notice
     request['session'] || {}
   end
 
-  # Backtrace containing only files from the app itself (ignore gems)
-  def app_backtrace
-    backtrace_lines.select { |l| l && l['file'] && l['file'].include?("[PROJECT_ROOT]") }
+  def in_app_backtrace_lines
+    backtrace_lines.in_app
   end
 
   protected
diff --git a/app/views/mailer/err_notification.html.haml b/app/views/mailer/err_notification.html.haml
index d6fbb23..ed9a4ea 100644
--- a/app/views/mailer/err_notification.html.haml
+++ b/app/views/mailer/err_notification.html.haml
@@ -27,16 +27,15 @@
               %p.heading WHERE:
               %p.monospace
                 = @notice.where
-              - if (app_backtrace = @notice.app_backtrace).any?
-                - app_backtrace.map {|l| "#{l['file']}:#{l['number']}" }.each do |line|
-                  %p.backtrace= line
+              - @notice.in_app_backtrace_lines.each do |line|
+                %p.backtrace= line
                 %br
               %p.heading URL:
               %p.monospace
                 - if @notice.request['url'].present?
                   = link_to @notice.request['url'], @notice.request['url']
               %p.heading BACKTRACE:
-              - @notice.backtrace_lines.map {|l| l ? "#{l['file']}:#{l['number']}" : nil }.compact.each do |line|
+              - @notice.backtrace_lines.each do |line|
                 %p.backtrace= line
               %br
 
diff --git a/app/views/mailer/err_notification.text.erb b/app/views/mailer/err_notification.text.erb
index 5c2151b..f9c1caa 100644
--- a/app/views/mailer/err_notification.text.erb
+++ b/app/views/mailer/err_notification.text.erb
@@ -14,7 +14,7 @@ WHERE:
 
 <%= @notice.where %>
 
-<% @notice.app_backtrace.map {|l| "#{l['file']}:#{l['number']}" }.each do |line| %>
+<% @notice.in_app_backtrace_lines.each do |line| %>
   <%= line %>
 <% end %>
 
@@ -26,7 +26,7 @@ URL:
 
 BACKTRACE:
 
-<% @notice.backtrace_lines.map {|l| l ? "#{l['file']}:#{l['number']}" : nil }.compact.each do |line| %>
+<% @notice.backtrace_lines.each do |line| %>
   <%= line %>
 <% end %>
 
diff --git a/app/views/notices/_backtrace_line.html.haml b/app/views/notices/_backtrace_line.html.haml
index 56db410..ccc9a5a 100644
--- a/app/views/notices/_backtrace_line.html.haml
+++ b/app/views/notices/_backtrace_line.html.haml
@@ -1,5 +1,5 @@
 %tr{:class => defined?(row_class) ? row_class : nil}
-  %td.line{:class => (in_app_backtrace_line?(line) ? 'in-app' : nil)}
+  %td.line{:class => line.in_app? && 'in-app' }
     = link_to_source_file(@app, line) do
       %span.path>= path_for_backtrace_line(line)
       %span.file>=  file_for_backtrace_line(line)
--
libgit2 0.21.2