#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 [email protected].
To post to this group, send email to [email protected].
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.
