Defer FileFields causes errors when accessing them
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.
Change History
(9)
| Triage Stage: |
Unreviewed → Accepted
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| Triage Stage: |
Accepted → Ready for checkin
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| Patch needs improvement: |
set
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| Triage Stage: |
Ready for checkin → Accepted
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| Patch needs improvement: |
unset
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| Resolution: |
→ fixed
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| Status: |
new → closed
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A regression test for Django's test suite