#26900: Defer FileFields causes errors when accessing them
----------------------------------------------+--------------------
Reporter: samuelmaudo | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.10
Severity: Release blocker | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
----------------------------------------------+--------------------
The problem is in `FileDescriptor.__get__()`. That method obtains the file
directly from `instance.__dict__` but, from Django 1.10, deferred fields
don't create any item in `instance.__dict__`, so a KeyError is raised.
Moreover, ImageFields access the file each time a model is instantiated to
update dimension fields, so a KeyError is raised whenever an instance with
a deferred ImageField is created.
The obvious solution is change `file = instance.__dict__[self.field.name]`
for `file = instance.__dict__.get(self.field.name)` inside of
`FileDescriptor.__get__()` but I am not sure about the consequences.
--
Ticket URL: <https://code.djangoproject.com/ticket/26900>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-updates+unsubscr...@googlegroups.com.
To post to this group, send email to django-updates@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/054.d567d1f21c5608fb03ae6169346b1aa8%40djangoproject.com.
For more options, visit https://groups.google.com/d/optout.
