Add 'user friendly' datastore API.

service/rawdatastore/errors.go

Index: service/rawdatastore/errors.go
diff --git a/service/rawdatastore/errors.go b/service/rawdatastore/errors.go
deleted file mode 100644
index 6ab0b563733268fc66c6ed1833e8d21ab46c0869..0000000000000000000000000000000000000000
--- a/service/rawdatastore/errors.go
+++ /dev/null
@@ -1,42 +0,0 @@
-// 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.
-
-package rawdatastore
-
-import (
-	"fmt"
-	"reflect"
-
-	"google.golang.org/appengine/datastore"
-)
-
-// These errors are returned by various rawdatastore.Interface methods.
-var (
-	ErrInvalidEntityType     = datastore.ErrInvalidEntityType
-	ErrInvalidKey            = datastore.ErrInvalidKey
-	ErrNoSuchEntity          = datastore.ErrNoSuchEntity
-	ErrConcurrentTransaction = datastore.ErrConcurrentTransaction
-	ErrQueryDone             = datastore.Done
-
-	// ErrMetaFieldUnset is returned from PropertyLoadSaver.{Get,Set}Meta
-	// implementations when the specified meta key isn't set on the struct at
-	// all.
-	ErrMetaFieldUnset = fmt.Errorf("gae: meta field unset")
-)
-
-// ErrFieldMismatch is returned when a field is to be loaded into a different
-// type than the one it was stored from, or when a field is missing or
-// unexported in the destination struct.
-// StructType is the type of the struct pointed to by the destination argument
-// passed to Get or to Iterator.Next.
-type ErrFieldMismatch struct {
-	StructType reflect.Type
-	FieldName  string
-	Reason     string
-}
-
-func (e *ErrFieldMismatch) Error() string {
-	return fmt.Sprintf("gae: cannot load field %q into a %q: %s",
-		e.FieldName, e.StructType, e.Reason)
-}