Django FileField (or ImageField) open() method returns None for valid file?

Question

let me put it like this:

model.py:

class Task(models.Model):
    ...
    seq_file = models.FileField(upload_to=\'files/\', blank=True, null=True)
    ...         


        

Answer 1

When in doubt, check the code. Here's an excerpt from django.db.models.fields.files:

def open(self, mode='rb'):
    self._require_file()
    self.file.open(mode)
# open() doesn't alter the file's contents, but it does reset the pointer
open.alters_data = True

So, in the case of a FileField, open reopens the file using the specified mode. Then, once you call open, you can continue to use methods like read using the newly applied mode.