Preserve last_modified and etag fields after reloading GTFS Feeds
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@ -1,4 +1,5 @@
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from django.apps import AppConfig
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from django.db.models.signals import pre_save
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from django.utils.translation import gettext_lazy as _
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@ -6,3 +7,8 @@ class TrainvelGTFSConfig(AppConfig):
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default_auto_field = "django.db.models.BigAutoField"
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name = "trainvel.gtfs"
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verbose_name = _("Trainvel - GTFS")
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def ready(self):
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from trainvel.gtfs import signals
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pre_save.connect(signals.keep_gtfs_feed_modification_date, sender="gtfs.GTFSFeed")
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@ -0,0 +1,14 @@
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from trainvel.gtfs.models import GTFSFeed
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def keep_gtfs_feed_modification_date(instance: GTFSFeed, raw: bool = True, **_kwargs):
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"""
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Keep the last_modified and etag fields from the existing GTFSFeed instance when saving a new one.
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"""
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if raw and GTFSFeed.objects.filter(pk=instance.pk).exists():
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# If a GTFSFeed instance is being saved from a raw query,
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# we want to keep the last_modified and etag fields from the existing instance.
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# This is useful when loading initial data from a fixture, for example.
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old_instance = GTFSFeed.objects.get(pk=instance.pk)
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instance.last_modified = old_instance.last_modified
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instance.etag = old_instance.etag
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