Django: How to replace/overwrite/update/change a file of FileField?
django, django-models, python
Solution
You have two choices.
I'll assume your `Project` model is only a snippet of code.
Option 1 is to break your model down so that a Project does not have a single file, but rather a Project model is associated with a ProjectFile model. Perhaps one-to-many. One Project as many ProjectFiles. That is, ProjectFile has a ForeigKey to Project.
Then you can add new ProjectFile based on an old ProjectFile. You can delete them, and fool around all you want. Indeed, you can keep both ProjectFile's with an indicator of which is "current".
Option 2 is to `self.video.open("w")` to open the file for writing. Rewrite the contents "in place". Instead of deleting and replacing the file, rewrite the old file with the new content.
with open(video_path ,"rb") as source:
self.video.open("wb")
bytes= source.read(4096)
if bytes:
self.video.write( bytes )
bytes= source.read(4096)
That will probably do what you want.
Yes, it seems inefficient. It's really not that bad. The conversion takes for ever. The copy takes moments.
Problem
In Django, I have the following model: ``` from django.db import models from django.core.files.base import File import os, os.path class Project(models.Model): video = models.FileField(upload_to="media") def replace_video(self): """Convert video to WebM format.""" # This is where the conversion takes place, # returning a path to the new converted video # that I wish to override the old one. video_path = convert_video() # Replace old video with new one, # and remove original unconverted video and original copy of new video. self.video.delete(save=True) self.video.save(os.path.basename(video_path), File(open(video_path ,"wb")), save=True) os.remove(video_path) ``` I want to be able to replace the file in the FileField video on a model object/instance. The above method I've written does not work. Once I delete the original file, I get the following error: ``` ValueError: The 'video' attribute has no file associated with it. ``` How can I replace the file with an updated one, and remove the original one (no more necessary)? Side-Note: I have found a related issue, but with no satisfying answer.