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Django

prefetch_related

Fetches multi-valued relations (ManyToMany, reverse FK) in a second query and joins them in Python.

Two queries instead of N+1. Prefetch() lets you filter or order the prefetched set, which is the follow-up question.

Follows single-valued relations (ForeignKey, OneToOne) with a SQL JOIN in the same query.

One query for a list, then one extra query per row when a related field is accessed.

This term is part of the free Python Full-Stack interview preparation module - browse the full glossary for every definition.

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