datastore: fix - mark transactions as finalized.

lib/datastore/request.js

@@ -253,12 +253,15 @@ DatastoreRequest.prototype.save = function(entities, callback) {
       callback(err);
       return;
     }
+    if (this.id) {
+      this.isFinalized = true;
+    }
     var autoInserted = (resp.mutation_result.insert_auto_id_key || []);
     autoInserted.forEach(function(key, index) {
       keys[insertIndexes[index]] = entity.keyFromKeyProto(key);
     });
     callback(null, isMultipleRequest ? keys : keys[0]);
-  });
+  }.bind(this));
 };
 
 /**
@@ -300,7 +303,12 @@ DatastoreRequest.prototype.delete = function(keys, callback) {
   }
   req = new pb.CommitRequest(req);
   var res = pb.CommitResponse;
-  this.createRequest_('commit', req, res, callback);
+  this.createRequest_('commit', req, res, function(err) {
+    if (!err && this.id) {
+      this.isFinalized = true;
+    }
+    callback.apply(null, util.toArray(arguments));
+  }.bind(this));
 };
 
 /**