ImageField: overwrite file if file with the same name exists.

Create a separate file storage.py:

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


class OverwriteStorage(FileSystemStorage):
    def get_available_name(self, name):
        """
        Returns a filename that's free on the target storage system, and
        available for new content to be written to.

        Found at http://djangosnippets.org/snippets/976/

        This file storage solves overwrite on upload problem. Another
        proposed solution was to override the save method on the model
        like so (from https://code.djangoproject.com/ticket/11663):

        def save(self, *args, **kwargs):
            try:
                this = MyModelName.objects.get(id=self.id)
                if this.MyImageFieldName != self.MyImageFieldName:
                    this.MyImageFieldName.delete()
            except: pass
            super(MyModelName, self).save(*args, **kwargs)
        """
        # If the filename already exists, remove it as if it was a true file system
        if self.exists(name):
            os.remove(os.path.join(settings.MEDIA_ROOT, name))
        return name

In model this should be set as:

from app.storage import OverwriteStorage

class Thing(models.Model):
    image = models.ImageField(
        max_length=SOME_CONST, storage=OverwriteStorage(), upload_to=image_path
    )

Source

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