From d9cd1e9222455836117f47160a43310929434ff0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafael=20Mendon=C3=A7a=20Fran=C3=A7a?=
 <rafaelmfranca@gmail.com>
Date: Wed, 11 Feb 2015 17:32:18 -0200
Subject: Revert 88d08f2ec9f89ba431cba8d0c06ac9ebc204bbbb

This caused a performance regression since we were decided to do the nil
check in run time not in the load time.

See https://github.com/rails/rails/pull/15187#issuecomment-71760058
---
 .../active_support/core_ext/module/delegation.rb   | 36 ++++++++++++++--------
 1 file changed, 24 insertions(+), 12 deletions(-)

(limited to 'activesupport/lib/active_support/core_ext/module/delegation.rb')

diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb
index 24df83800b..a5f4d03256 100644
--- a/activesupport/lib/active_support/core_ext/module/delegation.rb
+++ b/activesupport/lib/active_support/core_ext/module/delegation.rb
@@ -185,19 +185,31 @@ class Module
       # On the other hand it could be that the target has side-effects,
       # whereas conceptually, from the user point of view, the delegator should
       # be doing one call.
-
-      exception = %(raise DelegationError, "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}")
-
-      method_def = [
-        "def #{method_prefix}#{method}(#{definition})",
-        "  _ = #{to}",
-        "  if !_.nil? || nil.respond_to?(:#{method})",
-        "    _.#{method}(#{definition})",
-        "  else",
-        "    #{exception unless allow_nil}",
-        "  end",
+      if allow_nil
+        method_def = [
+          "def #{method_prefix}#{method}(#{definition})",
+          "_ = #{to}",
+          "if !_.nil? || nil.respond_to?(:#{method})",
+          "  _.#{method}(#{definition})",
+          "end",
         "end"
-      ].join ';'
+        ].join ';'
+      else
+        exception = %(raise DelegationError, "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}")
+
+        method_def = [
+          "def #{method_prefix}#{method}(#{definition})",
+          " _ = #{to}",
+          "  _.#{method}(#{definition})",
+          "rescue NoMethodError => e",
+          "  if _.nil? && e.name == :#{method}",
+          "    #{exception}",
+          "  else",
+          "    raise",
+          "  end",
+          "end"
+        ].join ';'
+      end
 
       module_eval(method_def, file, line)
     end
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