From 5f3b40e824cce3f6dcdfac63fa47bcd80d67dd5a Mon Sep 17 00:00:00 2001
From: Aditya Sanghi <aditya.sanghi@risingsuntech.net>
Date: Thu, 27 Dec 2012 19:24:16 +0530
Subject: [PATCH] fixes #8631 local inflections from interfereing with
 HTTP_METHOD_LOOKUP dispatch logic

---
 actionpack/CHANGELOG.md                       |  5 +++++
 .../lib/action_dispatch/http/request.rb       |  7 ++++++-
 actionpack/test/dispatch/request_test.rb      | 21 +++++++++++++++++++
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index eca24cde1a210..42eced7a3781a 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## Rails 3.2.12 (unreleased) ##
 
+*   Eagerly populate the http method loookup cache so local project inflections do
+    not interfere with use of underscore method ( and we don't need locks )
+
+    *Aditya Sanghi*
+
 *   `BestStandardsSupport` no longer duplicates `X-UA-Compatible` values on
     each request to prevent header size from blowing up.
 
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 2fac9668c18fd..31155732d29bc 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -56,7 +56,12 @@ def key?(key)
     RFC5789 = %w(PATCH)
 
     HTTP_METHODS = RFC2616 + RFC2518 + RFC3253 + RFC3648 + RFC3744 + RFC5323 + RFC5789
-    HTTP_METHOD_LOOKUP = Hash.new { |h, m| h[m] = m.underscore.to_sym if HTTP_METHODS.include?(m) }
+    HTTP_METHOD_LOOKUP = {}
+
+    # Populate the HTTP method lookup cache
+    HTTP_METHODS.each do |method|
+      HTTP_METHOD_LOOKUP[method] = method.underscore.to_sym
+    end
 
     # Returns the HTTP \method that the application should see.
     # In the case where the \method was overridden by a middleware
diff --git a/actionpack/test/dispatch/request_test.rb b/actionpack/test/dispatch/request_test.rb
index 56431b4daf61c..dfd3ddbfa6e7d 100644
--- a/actionpack/test/dispatch/request_test.rb
+++ b/actionpack/test/dispatch/request_test.rb
@@ -371,6 +371,27 @@ def url_for(options = {})
     assert request.put?
   end
 
+  test "post uneffected by local inflections" do
+    existing_acrnoyms = ActiveSupport::Inflector.inflections.acronyms.dup
+    existing_acrnoym_regex = ActiveSupport::Inflector.inflections.acronym_regex.dup
+    begin
+      ActiveSupport::Inflector.inflections do |inflect|
+        inflect.acronym "POS"
+      end
+      assert_equal "pos_t", "POST".underscore
+      request = stub_request "REQUEST_METHOD" => "POST"
+      assert_equal :post, ActionDispatch::Request::HTTP_METHOD_LOOKUP["POST"]
+      assert_equal :post, request.method_symbol
+      assert request.post?
+    ensure
+      # Reset original acronym set
+      ActiveSupport::Inflector.inflections do |inflect|
+        inflect.send(:instance_variable_set,"@acronyms",existing_acrnoyms)
+        inflect.send(:instance_variable_set,"@acronym_regex",existing_acrnoym_regex)
+      end
+    end
+  end
+
   test "xml format" do
     request = stub_request
     request.expects(:parameters).at_least_once.returns({ :format => 'xml' })