appengine/findit/gae_libs/model/versioned_model.py - Issue 2488113005: [Findit] Re-org code.

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Side by Side Diff: appengine/findit/gae_libs/model/versioned_model.py

Issue 2488113005: [Findit] Re-org code. (Closed)

Patch Set: Address new comments. Created 4 years, 1 month ago

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1 # Copyright 2015 The Chromium Authors. All rights reserved.	1 # Copyright 2015 The Chromium Authors. All rights reserved.

2 # Use of this source code is governed by a BSD-style license that can be	2 # Use of this source code is governed by a BSD-style license that can be

3 # found in the LICENSE file.	3 # found in the LICENSE file.

4	4

5 """Provides a model to support versioned entities in datastore.	5 """Provides a model to support versioned entities in datastore.

6	6

7 Idea: use a root model entity to keep track of the most recent version of a	7 Idea: use a root model entity to keep track of the most recent version of a

8 versioned entity, and make the versioned entities and the root model entity in	8 versioned entity, and make the versioned entities and the root model entity in

9 the same entity group so that they could be read and written in a transaction.	9 the same entity group so that they could be read and written in a transaction.

10 """	10 """

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155	155

156 @classmethod	156 @classmethod

157 def _get_kind(cls):	157 def _get_kind(cls):

158 return root_model_name	158 return root_model_name

159	159

160 return _RootModel	160 return _RootModel

161	161

162 @classmethod	162 @classmethod

163 def _GetRootKey(cls, key=None):	163 def _GetRootKey(cls, key=None):

164 return ndb.Key(cls._GetRootModel(), key if key is not None else 1)	164 return ndb.Key(cls._GetRootModel(), key if key is not None else 1)

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