Update FileField: what is the name of the old file

[Nonverbis M]

Django 1.11

When FileUpdate is called, I substitute the old file with a new one. I'd like to handle the old file. Namely move it to some other directory.

Could you have a look at the picture below. New file is called "C book 1.pdf". Existing file is called "4_Oracle_Database_11g_PLSQL_Fundamentals_PLSQL.pdf".

But at the breakpoint (see comment in form_valid), old_file_name = C book 1.pdf.

But I can't catch why. I call super(FileUpdate, self).form_valid(form) in a couple of lines. And only there self.object = form.save().

At the breakpoint I expect self.object to be the unchanged object. Existing one.

Could you help me understand how to catch the file name of the old file.

class UserFile(models.Model):
    uuid = models.UUIDField(primary_key=False, default=uuid.uuid4,
                            editable=False)
    user_file = models.FileField(verbose_name=_("file"),
                                 max_length=255,
                                 upload_to=get_file_path)

class FileUpdate(UpdateView):
    model = UserFile
    form_class = FileForm

    def form_valid(self, form):
        """
        Delete old file.
        """
        parent_directory = get_parent_directory_of_file(self.object)
        old_file_name = self.object.user_file.name # Breakpoint
        self.object.user_file.delete()
        return super(FileUpdate, self).form_valid(form)

[Melvyn Sopacua]

On Sunday 07 May 2017 16:10:27 Nonverbis M wrote:

 

> class FileUpdate(UpdateView):

> model = UserFile

> form_class = FileForm

>

> def form_valid(self, form):

> """

> Delete old file.

> """

> parent_directory = get_parent_directory_of_file(self.object)

> old_file_name = self.object.user_file.name # Breakpoint

> self.object.user_file.delete()

> return super(FileUpdate, self).form_valid(form)

 

I've battled with this too and by far the simplest way to solve it, is to put the old file name in the form as a hidden widget.

--

Melvyn Sopacua