Allow numbers in partial name for digesting

Add failing test for template with number at the end

Use \w for RENDER_DEPENDENCY regex

Spacing

Add CHANGELOG entry

actionpack/CHANGELOG.md

-* No changes.
+*   Fix an issue where partials with a number in the filename weren't being digested for cache dependencies.
+
+    *Bryan Ricker*
 
 Please check [4-0-stable](https://github.com/rails/rails/blob/4-0-stable/actionpack/CHANGELOG.md) for previous changes.

actionpack/lib/action_view/dependency_tracker.rb

@@ -39,7 +39,7 @@ class ERBTracker
         render\s*                     # render, followed by optional whitespace
         \(?                           # start an optional parenthesis for the render call
         (partial:|:partial\s+=>)?\s*  # naming the partial, used with collection -- 1st capture
-        ([@a-z"'][@a-z_\/\."']+)      # the template name itself -- 2nd capture
+        ([@a-z"'][@\w\/\."']+)        # the template name itself -- 2nd capture
       /x
 
       def self.call(name, template)

actionpack/test/fixtures/digestor/messages/show.html.erb

@@ -7,7 +7,8 @@
 <%= render @message.history.events %>
 
 <%# render "something_missing"  %>
+<%# render "something_missing_1"  %>
 
 <%
   # Template Dependency: messages/form
-%>
+%>
\ No newline at end of file

actionpack/test/template/digestor_test.rb

@@ -83,6 +83,12 @@ def test_logging_of_missing_template
     end
   end
 
+  def test_logging_of_missing_template_ending_with_number
+    assert_logged "Couldn't find template for digesting: messages/something_missing_1.html" do
+      digest("messages/show")
+    end
+  end
+
   def test_nested_template_directory
     assert_digest_difference("messages/show") do
       change_template("messages/actions/_move")