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    <p>This is just an extension to <a href="https://stackoverflow.com/questions/2687724/copy-an-entity-in-google-app-engine-datastore-in-python-without-knowing-property/2712401#2712401">Nick Johnson's excellent code</a> to address the problems highlighted by Amir in the comments:</p> <ol> <li>The db.Key value of the ReferenceProperty is no longer retrieved via an unnecessary roundtrip to the datastore.</li> <li>You can now specify whether you want to skip DateTime properties with the <code>auto_now</code> and/or <code>auto_now_add</code> flag.</li> </ol> <p>Here's the updated code:</p> <pre><code>def clone_entity(e, skip_auto_now=False, skip_auto_now_add=False, **extra_args): """Clones an entity, adding or overriding constructor attributes. The cloned entity will have exactly the same property values as the original entity, except where overridden. By default it will have no parent entity or key name, unless supplied. Args: e: The entity to clone skip_auto_now: If True then all DateTimeProperty propertes will be skipped which have the 'auto_now' flag set to True skip_auto_now_add: If True then all DateTimeProperty propertes will be skipped which have the 'auto_now_add' flag set to True extra_args: Keyword arguments to override from the cloned entity and pass to the constructor. Returns: A cloned, possibly modified, copy of entity e. """ klass = e.__class__ props = {} for k, v in klass.properties().iteritems(): if not (type(v) == db.DateTimeProperty and ((skip_auto_now and getattr(v, 'auto_now')) or (skip_auto_now_add and getattr(v, 'auto_now_add')))): if type(v) == db.ReferenceProperty: value = getattr(klass, k).get_value_for_datastore(e) else: value = v.__get__(e, klass) props[k] = value props.update(extra_args) return klass(**props) </code></pre> <p>The first <code>if</code> expression is not very elegant so I appreciate if you can share a better way to write it.</p>
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    1. POCopy an entity in Google App Engine datastore in Python without knowing property names at 'compile' time
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    1. COThanks for writing this. It's exactly what I was looking for. It does need one change; there is a reference to self even though this isn't an object method. The line `value = v.__get__(self, klass)` needs to change to `value = v.__get__(e, klass)`
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    2. COOpps, I missed a second reference to self. `value = getattr(klass, k).get_value_for_datastore(self) ` should become `value = getattr(klass, k).get_value_for_datastore(e) `
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    3. COCorrected. Thanks and sorry!
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