How To Solve N+1 Problem In Django

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The n+1 problem refers to a performance issue that can occur in software applications when we are not writing optimize queries to do operations on the database. And It occurs when an application retrieves a set of parent records from the database, and then for each of those records, the application retrieves a set of child records. This problem is for each parent record, because the application issues a separate query to the database, resulting in “n+1” queries being made to the database (1 query for the parent records, and 1 query for each child record). This can lead to poor performance and scalability issues, as the number of queries grows with the number of parent and child records.

There are several ways to solve the n+1 problem in Django, a popular Python web framework that is often used with databases. Some common techniques include:

Let's try to understand by seeing an example of an n+1 problem in the Django

#models.py
class Author(models.Model):
  name = models.CharField(max_length=255)

class Book(models.Model):
  title = models.CharField(max_length=255)
  author = models.ForeignKey(Author, on_delete=models.CASCADE)

# views.py
def list_books(request):
  books =…