What are the best practices for using Django QuerySets?

What are the best practices for using Django QuerySets?

Some best practices include using select_related and prefetch_related to optimize database access, filtering data as early as possible, and avoiding unnecessary queries.

Can you explain the difference between select_related and prefetch_related?

Sure! select_related is used for single-valued relationships and performs a SQL join, while prefetch_related is for multi-valued relationships and executes separate queries.

How can I chain QuerySets effectively?

You can chain QuerySets by using methods like filter(), exclude(), and annotate() in a single line, which helps in building complex queries.

What should I avoid when working with QuerySets?

Avoid using all() without filters, as it retrieves all records, and be cautious with count() on large datasets, as it can be slow.