Set Django's FileField to an existing file


Question

I have an existing file on disk (say /folder/file.txt) and a FileField model field in Django.

When I do

instance.field = File(file('/folder/file.txt'))
instance.save()

it re-saves the file as file_1.txt (the next time it's _2, etc.).

I understand why, but I don't want this behavior - I know the file I want the field to be associated with is really there waiting for me, and I just want Django to point to it.

How?

1
78
11/30/2011 8:20:28 PM

Accepted Answer

If you want to do this permanently, you need to create your own FileStorage class

import os
from django.conf import settings
from django.core.files.storage import FileSystemStorage

class MyFileStorage(FileSystemStorage):

    # This method is actually defined in Storage
    def get_available_name(self, name):
        if self.exists(name):
            os.remove(os.path.join(settings.MEDIA_ROOT, name))
        return name # simply returns the name passed

Now in your model, you use your modified MyFileStorage

from mystuff.customs import MyFileStorage

mfs = MyFileStorage()

class SomeModel(model.Model):
   my_file = model.FileField(storage=mfs)
19
6/11/2018 6:18:32 PM

just set instance.field.name to the path of your file

e.g.

class Document(models.Model):
    file = FileField(upload_to=get_document_path)
    description = CharField(max_length=100)


doc = Document()
doc.file.name = 'path/to/file'  # must be relative to MEDIA_ROOT
doc.file
<FieldFile: path/to/file>

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