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Django QuerySets are lazy. When is the database actually queried?

A As soon as the QuerySet is defined
B When the QuerySet is iterated, sliced with a step, or otherwise evaluated
C Only when save() is called
D At the end of the request

Answer

When the QuerySet is iterated, sliced with a step, or otherwise evaluated

Laziness allows filters to be chained without extra queries. Evaluation happens on iteration, len(), list(), bool() and similar operations.

All Django MCQs

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