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POis there shortcut method called insert_or_update in AppEngine (or perhaps in Django)? Why not?
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<p>I repeat this kind of pattern many times: (and I think isn't this common?)</p> <p><strong>Google App Engine</strong></p> <pre><code># Insert if object doesn't exist, Otherwise Update Object obj = get_or_insert('123', title='Hello World') obj.title = 'Hello World' obj.puts() </code></pre> <p><strong>Django</strong></p> <pre><code># Insert if object doesn't exist, Otherwise Update Object obj, created = Model.objects.get_or_create(id='123', defaults={'title':'Hello World'} if not created: obj.title = 'Hello World' obj.save() </code></pre> <p>It would be good <strong>if</strong> I <strong>could</strong> just call <code>insert_or_update</code>. isn't it? e.g:</p> <pre><code># AppEngine obj = insert_or_update('123', title='Hello World') # Django obj = Model.objects.insert_or_update(id='123', defaults={'title': 'Hello World'}) </code></pre> <h1>UPDATE</h1> <p>Back to App Engine <a href="https://developers.google.com/appengine/docs/python/datastore/modelclass#Model_get_or_insert" rel="nofollow noreferrer">documentation</a>, I found the snippet on what this <code>get_or_insert</code> method doing. Something like the following:</p> <pre><code>def txn(key_name, **kwds): entity = Story.get_by_key_name(key_name, parent=kwds.get('parent')) if entity is None: entity = Story(key_name=key_name, **kwds) entity.put() return entity def get_or_insert(key_name, **kwargs): return db.run_in_transaction(txn, key_name, **kwargs) get_or_insert('some key', title="The Three Little Pigs") </code></pre> <p>I was wondering why a <code>insert_or_update</code> method not being created in both app engine and django.</p> <h2>App Engine Workaround</h2> <pre><code>@classmethod def insert_or_update(cls, key_name, parent=None, **kwargs): def _tx(): entity = cls.get_by_key_name(key_name, parent=parent) if entity: for key in kwargs: setattr(entity, key, kwargs[key]) else: entity = cls(key_name=key_name, parent=parent, **kwargs) entity.put() return entity return db.run_in_transaction(_tx) </code></pre> <h2>Django Solution</h2> <p><a href="https://stackoverflow.com/a/20430268/764592">See Below</a></p>
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