How can I use aggregations in Django models?
An example of an AI chatbot conversation about using aggregations in Django models.
How can I use aggregations in Django models?
You can use the annotate() and aggregate() methods in Django to perform aggregations on your models.
Can you give me an example of using aggregate()?
Sure! If you have a Book model, you can calculate the average price like this: Book.objects.aggregate(Avg('price')).
What about using annotate()?
With annotate(), you can add a calculated field to each object. For example, Book.objects.annotate(num_authors=Count('authors')) adds a count of authors to each book.
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