How to make FactoryBoy's ImageField generate image before save() is called?

问题

Subj.

Right now (Factory Boy ver. 2.4.1.) with this code:

class ImageFactory(factory.django.DjangoModelFactory):
    class Meta:
        model = Image

    image = factory.django.ImageField(width=1024, height=768)

image will be None at save time, so if the Image model has save overridden and its operates with the image, it will fail. And thats exactly my case.

So - how to make image generated before save call?

回答1:

I've found a workaround:

class ImageFactory(factory.django.DjangoModelFactory):
    class Meta:
        model = Image

    image = factory.LazyAttribute(
            lambda _: ContentFile(
                factory.django.ImageField()._make_data(
                    {'width': 1024, 'height': 768}
                ), 'example.jpg'
            )
        )

来源：https://stackoverflow.com/questions/25806428/how-to-make-factoryboys-imagefield-generate-image-before-save-is-called