service/datastore: Call MGS GetAllMeta() in Save()

service/datastore/pls_impl.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // HEAVILY adapted from github.com/golang/appengine/datastore
 
 package datastore
 
 import (
         "fmt"
@@ skipping 187 matching lines @@
                 }
                 set(pVal)
         }
         if slice.IsValid() {
                 slice.Set(reflect.Append(slice, v))
         }
         return ""
 }
 
 func (p *structPLS) Save(withMeta bool) (PropertyMap, error) {
+        if err := p.Problem(); err != nil {
+                return nil, err
+        }
+
         ret := PropertyMap(nil)
         if withMeta {
-                ret = p.GetAllMeta()
+                ret = getMGS(p.o.Addr().Interface()).GetAllMeta()
         } else {
                 ret = make(PropertyMap, len(p.c.byName))
         }
         if _, err := p.save(ret, "", ShouldIndex); err != nil {
                 return nil, err
         }
         return ret, nil
 }
 
 func (p *structPLS) getDefaultKind() string {
@@ skipping 359 matching lines @@
                 switch val {
                 case "on", "On", "true":
                         return true, nil
                 case "off", "Off", "false":
                         return false, nil
                 }
                 return nil, fmt.Errorf("Toggle field has bad/missing default, got %q", val)
         }
         return nil, fmt.Errorf("helper: meta field with bad type/value %s/%q", t, val)
 }