From b17bc58c76c580911e18f2dd90a17aaae192a2a3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@gmail.com>
Date: Thu, 15 Dec 2011 20:46:30 +0100
Subject: Move delegation reponsibilities of Relation to a module. Also
 precompile method missing calls for rofscale.

---
 .../lib/active_record/relation/delegation.rb       | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 activerecord/lib/active_record/relation/delegation.rb

(limited to 'activerecord/lib/active_record/relation/delegation.rb')

diff --git a/activerecord/lib/active_record/relation/delegation.rb b/activerecord/lib/active_record/relation/delegation.rb
new file mode 100644
index 0000000000..c1fcd48a8e
--- /dev/null
+++ b/activerecord/lib/active_record/relation/delegation.rb
@@ -0,0 +1,42 @@
+require 'active_support/core_ext/module/delegation'
+
+module ActiveRecord
+  module Delegation
+    # These are explicitly delegated to improve performance (avoids method_missing)
+    delegate :to_xml, :to_yaml, :length, :collect, :map, :each, :all?, :include?, :to_ary, :to => :to_a
+    delegate :ast, :engine, :to => :arel
+    delegate :table_name, :quoted_table_name, :primary_key, :quoted_primary_key,
+             :connection, :columns_hash, :auto_explain_threshold_in_seconds, :to => :klass
+
+    def self.delegate_to_scoped_klass(method)
+      if method.to_s =~ /[a-z]\w*!?/
+        module_eval <<-RUBY, __FILE__, __LINE__ + 1
+          def #{method}(*args, &block)
+            scoping { @klass.#{method}(*args, &block) }
+          end
+        RUBY
+      else
+        module_eval <<-RUBY, __FILE__, __LINE__ + 1
+          def #{method}(*args, &block)
+            scoping { @klass.send(#{method.inspect}, *args, &block) }
+          end
+        RUBY
+      end
+    end
+
+    protected
+
+    def method_missing(method, *args, &block)
+      if Array.method_defined?(method)
+        to_a.send(method, *args, &block)
+      elsif @klass.respond_to?(method)
+        ::ActiveRecord::Delegation.delegate_to_scoped_klass(method)
+        scoping { @klass.send(method, *args, &block) }
+      elsif arel.respond_to?(method)
+        arel.send(method, *args, &block)
+      else
+        super
+      end
+    end
+  end
+end
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