Advanced Django queries

Tue, 27 Jul 2021 00:00:00 +0000

Django Framework comes with a powerful ORM and query capabilities built-in. If you’re only familiar with the basics of Djangos Query API, this article will introduce some more advanced queries and methods you can use.

In the examples, I’ll be using the following data models.

class Author(models.Model):
    nickname = models.CharField(max_length=20, null=True, blank=True)
    firstname = models.CharField(max_length=20)
    lastname = models.CharField(max_length=40)
    birth_date = models.DateField()


class Book(models.Model):
    author = models.ForeignKey(Author, related_name="books", on_delete=models.CASCADE)
    title = models.CharField(unique=True, max_length=100)
    category = models.CharField(max_length=50)
    published = models.DateField()
    price = models.DecimalField(decimal_places=2, max_digits=6)
    rating = models.IntegerField()

Filtering

Basic filtering in Django can be done using something called field lookups with the filter method. Field lookups consist of the field and a suffix defining the lookup type. If no suffix is defined, the default behavior is equivalent to using the exact suffix.

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Advanced Django queries

Filtering