Ban 1+N in Django  ↦

Alex Schepanovski:

I always thought of 1+N as a thing that you just keep in your head, catch on code reviews or via performance regressions. This worked well for a long time, however, the less control we have over our SQL queries the more likely it will sneak through those guards…

I tumbled on a couple of 1+Ns while reading a project code for an unrelated reason and it got me thinking – do I ever want Django to do that lazy loading stuff? And the answer was never.

Turns out the implementation of this is quite easy. ~15 loc for the naive version and ~35 for a more robust version. Give it a try if you, like Alex, never want to allow a 1+N in your Django app again.


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