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1: Use Select Related and Prefetch Related:
Django provides two handy methods for optimising queries involving ForeignKey and OneToOneField relationships: select_related and prefetch_related. These methods enable you to get related objects more efficiently, lowering the number of database searches.
# Example using select_related
queryset = MyModel.objects.select_related('related_model')
# Example using prefetch_related
queryset = MyModel.objects.prefetch_related('related_set')
https://erpsolutions.oodles.io/developer-blogs/Proven-Techniques-fo...
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