62 lines
1.8 KiB
Python
62 lines
1.8 KiB
Python
import os
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import uuid
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from django.db import models
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from django.dispatch import receiver
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from django.utils.translation import ugettext_lazy as _
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# Create your models here.
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class Place (models.Model):
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name = models.CharField(max_length=50)
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location = models.CharField(max_length=50)
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latitude = models.FloatField()
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longitude = models.FloatField()
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description = models.TextField()
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def __str__(self):
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return self.name
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class PlaceImage (models.Model):
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filename = models.ImageField(
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upload_to=lambda instance, filename: 'places/' + str(uuid.uuid4()),
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max_length=50
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)
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place = models.ForeignKey(Place, on_delete=models.CASCADE, related_name='images')
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description = models.TextField(blank=True)
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def __str__(self):
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return ' '.join([self.place.name, str(self.pk)])
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# These two auto-delete files from filesystem when they are unneeded:
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@receiver(models.signals.post_delete, sender=PlaceImage)
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def auto_delete_file_on_delete(sender, instance, **kwargs):
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"""
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Deletes file from filesystem
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when corresponding `PlaceImage` object is deleted.
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"""
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if instance.filename:
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if os.path.isfile(instance.filename.path):
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os.remove(instance.filename.path)
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@receiver(models.signals.pre_save, sender=PlaceImage)
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def auto_delete_file_on_change(sender, instance, **kwargs):
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"""
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Deletes old file from filesystem
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when corresponding `PlaceImage` object is updated
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with new file.
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"""
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if not instance.pk:
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return False
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try:
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old_file = PlaceImage.objects.get(pk=instance.pk).filename
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except PlaceImage.DoesNotExist:
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return False
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new_file = instance.filename
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if not old_file == new_file:
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if os.path.isfile(old_file.path):
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os.remove(old_file.path)
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