如何在子工厂（Django）中包含多对多字段？

Question

I have two models: Project and Tag . In Project there is ManyToManyField: project_tags I have written factories for both of them. The problem is that I don't know how to include TagFactory to ProjectFactory

I have tried:

project_tags = factory.SubFactory(TagFactory)

Error:

TypeError: Direct assignment to the forward side of a many-to-many set is prohibited. Use project_tags.set() instead

And also:

Project.project_tags.set()

Error:

AttributeError: 'ManyToManyDescriptor' object has no attribute 'set'

Answer 1

The simple solution is through factory.RelatedFactory or factory.RelatedFactoryList :

class ProjectFactory(factory.django.DjangoModelFactory):
    class Meta:
        model = Project

    tags = factory.RelatedFactoryList(
        TagFactory,
        size=4,
    )