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Django test fixtures with factory_boy

Priya Sharma Jan 2026
1 tab 
import factory
from factory.django import DjangoModelFactory
from factory import Faker, SubFactory, post_generation
from blog.models import Post, Comment, Tag
from django.contrib.auth import get_user_model

User = get_user_model()


class UserFactory(DjangoModelFactory):
    class Meta:
        model = User

    email = Faker('email')
    first_name = Faker('first_name')
    last_name = Faker('last_name')
    is_active = True


class TagFactory(DjangoModelFactory):
    class Meta:
        model = Tag

    name = factory.Sequence(lambda n: f'tag-{n}')


class PostFactory(DjangoModelFactory):
    class Meta:
        model = Post

    title = Faker('sentence', nb_words=6)
    content = Faker('paragraph', nb_sentences=10)
    author = SubFactory(UserFactory)
    status = 'published'

    @post_generation
    def tags(self, create, extracted, **kwargs):
        if not create:
            return
        if extracted:
            for tag in extracted:
                self.tags.add(tag)


class CommentFactory(DjangoModelFactory):
    class Meta:
        model = Comment

    post = SubFactory(PostFactory)
    author = SubFactory(UserFactory)
    content = Faker('paragraph')
    approved = True
1 file · python Explain with highlit

Factory Boy eliminates boilerplate in tests by generating model instances with sensible defaults. I use Sequence for unique values, SubFactory for foreign keys, and post_generation for many-to-many relationships. The Faker integration provides realistic data. I create factories in tests/factories.py and import them across test files. For related objects, LazyAttribute computes values based on other fields. This makes tests more readable and maintainable than manual object creation. I can override any attribute when calling the factory.

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