Where should I put the code for automatically creating a fragment counter in Google App Engine / Django when creating a new model?

Question

I have a MyModel model (extending Google db.Model) and I want to track the number of models created.

I think the code from the Google I / O conversation on Sharding Counters is not bad, so I use this. But I'm not sure where I should call increment when creating new code. (I use Django, and I kept the familiar models.py models, views.py, etc. For project applications.)

There are a couple of possibilities that seem to come to mind where you can put incremental code:

• Overload Model.put () so that it increments the counter when the model was first saved, and similarly overload Model.delete () to decrease the counter

• Attach some kind of listener to the save / delete and check that the save has a new model (does GAE have such listeners?)

• Put the counter increment code in a function in view.py that creates / removes models

I would be very grateful for suggestions and thoughts on how to do this best (and the pros / cons of each option).

Thanks for reading.

Best, Brian

Answer 1

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