#32243: Saving filefields.
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Reporter: Gordon Wrigley | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 3.1
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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The documentation talks about how to set a filefield on a new object and
how to set a filefield using a form but I couldn't find anything that
talked about how to directly set a filefield on an existing object.
https://docs.djangoproject.com/en/3.1/topics/http/file-uploads/#handling-
uploaded-files-with-a-model
Maybe those docs could use some extra detail on how you can set an
existing file field by either assigning a ContentFile (with a name) to the
field and saving the instance, or by calling save on the field and passing
a ContentFile and a name. And particularly how the name is required in
both cases and will be passed through upload_to.
Further figuring this out for myself was substantially complicated by the
following behaviour:
{{{
In [24]: e=MyModel.objects.first()
In [25]: e.my_file
Out[25]: <FieldFile: None>
In [26]: e.my_file=ContentFile(content=b"fred")
In [27]: e.save()
In [28]: e=MyModel.objects.first()
In [29]: e.my_file
Out[29]: <FieldFile: None>
In [30]: e.my_file=ContentFile(content=b"bob", name="bob.txt")
In [31]: e.save()
In [32]: e=MyModel.objects.first()
In [33]: e.my_file
Out[33]: <FieldFile: files/5bc2fe4c-4262-4134-9397-c740de5a7edf/bob.txt>
In [34]: e.my_file.open().read()
Out[34]: b'bob'
}}}
Particularly 26-29 where setting the filefield to a ContentFile with no
name and then saving is effectively just ignored with no error.
Is this expected behaviour?
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Ticket URL: <https://code.djangoproject.com/ticket/32243>
Django <https://code.djangoproject.com/>
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