30 lines
1.1 KiB
Python
30 lines
1.1 KiB
Python
"""Signal handlers for the submissions app.
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The cleanup story (plan.md §7.6): when a `Submission` row is deleted --
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manually, via `cleanup_stale`, or for any other reason -- the uploaded
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`.stl` file must also be unlinked from `MEDIA_ROOT`. Django's `FileField`
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does NOT do this automatically (the behaviour was removed in 1.3, ages
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ago), so we wire a `post_delete` signal to take care of it.
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"""
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from __future__ import annotations
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from django.db.models.signals import post_delete
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from django.dispatch import receiver
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from .models import Submission
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@receiver(post_delete, sender=Submission)
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def unlink_stl_file_on_delete(sender, instance: Submission, **kwargs) -> None:
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"""Remove the on-disk `.stl` after a Submission row is deleted.
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`FileField.delete(save=False)` is idempotent: it just calls
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`Storage.delete(name)`, and `FileSystemStorage.delete` catches
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`FileNotFoundError`. Safe to call on rows that never had a file
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(e.g. URL-source submissions) -- the `if instance.stl_file` truthiness
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check handles that.
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"""
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if instance.stl_file:
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instance.stl_file.delete(save=False)
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