Move runtime back to the Thread.current

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -34,13 +34,11 @@ module ActiveRecord
       include QueryCache
       include ActiveSupport::Callbacks
 
-      attr_accessor :runtime
       define_callbacks :checkout, :checkin
 
       def initialize(connection, logger = nil) #:nodoc:
         @active = nil
         @connection, @logger = connection, logger
-        @runtime = 0
         @query_cache_enabled = false
         @query_cache = {}
         @instrumenter = ActiveSupport::Notifications.instrumenter
@@ -92,11 +90,6 @@ module ActiveRecord
         false
       end
 
-      def reset_runtime #:nodoc:
-        rt, @runtime = @runtime, 0
-        rt
-      end
-
       # QUOTING ==================================================
 
       # Override to return the quoted table name. Defaults to column quoting.

activerecord/lib/active_record/log_subscriber.rb

@@ -1,13 +1,25 @@
 module ActiveRecord
   class LogSubscriber < ActiveSupport::LogSubscriber
+    def self.runtime=(value)
+      Thread.current["active_record_sql_runtime"] = value
+    end
+
+    def self.runtime
+      Thread.current["active_record_sql_runtime"] ||= 0
+    end
+
+    def self.reset_runtime
+      rt, self.runtime = runtime, 0
+      rt
+    end
+
     def initialize
       super
       @odd_or_even = false
     end
 
     def sql(event)
-      connection = ActiveRecord::Base.connection
-      connection.runtime += event.duration
+      self.class.runtime += event.duration
       return unless logger.debug?
 
       name = '%s (%.1fms)' % [event.payload[:name], event.duration]
@@ -33,4 +45,4 @@ module ActiveRecord
   end
 end
 
-ActiveRecord::LogSubscriber.attach_to :active_record
+ActiveRecord::LogSubscriber.attach_to :active_record

activerecord/lib/active_record/railties/controller_runtime.rb

@@ -11,10 +11,9 @@ module ActiveRecord
 
       def cleanup_view_runtime
         if ActiveRecord::Base.connected?
-          connection = ActiveRecord::Base.connection
-          db_rt_before_render = connection.reset_runtime
+          db_rt_before_render = ActiveRecord::LogSubscriber.reset_runtime
           runtime = super
-          db_rt_after_render = connection.reset_runtime
+          db_rt_after_render = ActiveRecord::LogSubscriber.reset_runtime
           self.db_runtime = db_rt_before_render + db_rt_after_render
           runtime - db_rt_after_render
         else

activerecord/test/cases/log_subscriber_test.rb

@@ -57,4 +57,8 @@ class LogSubscriberTest < ActiveRecord::TestCase
     wait
     assert_equal 0, @logger.logged(:debug).size
   end
+
+  def test_initializes_runtime
+    Thread.new { assert_equal 0, ActiveRecord::LogSubscriber.runtime }.join
+  end
 end