adding active_connection? to the connection pool

activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb

@@ -151,6 +151,12 @@ def connection
         @reserved_connections[current_connection_id] ||= checkout
       end
 
+      # Check to see if there is an active connection in this connection
+      # pool.
+      def active_connection?
+        @reserved_connections.key? current_connection_id
+      end
+
       # Signal that the thread is finished with the current connection.
       # #release_connection releases the connection-thread association
       # and returns the connection to the pool.

activerecord/test/cases/connection_pool_test.rb

@@ -18,6 +18,14 @@ def setup
         end
       end
 
+      def test_active_connection?
+        assert !@pool.active_connection?
+        assert @pool.connection
+        assert @pool.active_connection?
+        @pool.release_connection
+        assert !@pool.active_connection?
+      end
+
       def test_pool_caches_columns
         columns = @pool.columns['posts']
         assert_equal columns, @pool.columns['posts']