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    <p>I agree that <code>ComputedProperty</code> is the way to go for the specific scenario described. However, it could still be useful to overload the <code>put</code> function. For instance, we employ the following code to keep track of all of the callers who are issuing datastore writes so that we can easily debug spikes in writes.</p> <pre><code>from google.appengine.ext import db _orig_db_put_async = db.put_async _orig_db_model_put = db.Model.put def _new_db_put_async(models, *args, **kwargs): """Instrumented version of db.put_async (which db.put also calls).""" retval = _orig_db_put_async(models, *args, **kwargs) msg = ['query: %s' % _get_caller()] # 'models' can be either a single model instance, or a list of them. try: for model in models: msg.append(model.__class__.__name__ + '.&lt;db.put&gt;') except TypeError: msg.append(models.__class__.__name__ + '.&lt;db.put&gt;') instance_cache.increment(' -- '.join(msg)) return retval def _new_db_model_put(self, *args, **kwargs): """Like entity.put() but stores put-stats in the instance cache.""" retval = _orig_db_model_put(self, *args, **kwargs) msg = ['query: %s' % _get_caller()] msg.append(self.__class__.__name__ + '.&lt;put&gt;') instance_cache.increment(' -- '.join(msg)) return retval </code></pre> <p>This code keeps a count of which codepaths are issuing writes in memcache and then occasionally flushes it out to the logs. The log lines look something like this:</p> <p><code>3041: activity_summary.py:312 -- UserData.&lt;put&gt;</code></p> <p>Where <code>3041</code> is the number of times line <code>312</code> of activity_summary.py issued a <code>UserData.put()</code>.</p>
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    1. POHow to overwrite the put() method on a python app engine model?
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    1. USMatt Faus
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