How to save a local file in an ImageField in Django?

Question

Django

I am writing a new project on Django and finally decided to follow the TDD path. But I ran into a problem while testing the file upload. Because at the moment I don't have any forms yet, I just want to check the corresponding methods.
There is a class:

class Photos(models.Model):
    #*тут много чего опущено, но сути оно не меняет - в таком варианте тоже не работает
    photo_file = models.ImageField(upload_to=photos_storage)
    def add_photo(self, photo_file):
        with open(photo_file) as f:
            my_file = File(f)
            filename = "filename.jpg"
            self.photo_file.save(filename, my_file)

When checking the sizes of the source file and the uploaded one, I get:
AssertionError: 301202L is not 1830L
That is, only a fragment of the file gets into upload_to (I see that the fragment is because there is EXIF ​​at the beginning). I do not understand where to dig. Maybe when working with local files you need to do something else? Because if I take files from request.FILES it all works in another project.
I'm running Win7 if that matters. Django 1.5, Python 2.7.

Answer 1

No, well, it's necessary. 2 hours fought and fought, but it was necessary to change the mode to binary.
You need to do open(photo_file, "rb")