Initial

backend/app/models/category.py

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+from django.conf import settings
+from django.db import models
+from django.db.models.signals import post_delete
+from django.dispatch import receiver
+
+import json
+from colorfield.fields import ColorField
+
+import typing
+if typing.TYPE_CHECKING:
+    from app.models.place import Place
+
+
+class Category(models.Model):
+    name = models.CharField('Name', max_length=100)
+    color = ColorField('Farbe', default='#3388ff', max_length=7)
+    fg_color_white = models.BooleanField('Textfarbe Weiß', default=False)
+    sort = models.IntegerField('Sortierung', default=0)
+
+    places: 'models.QuerySet[Place]'
+
+    class Meta:
+        verbose_name = 'Kategorie'
+        verbose_name_plural = 'Kategorien'
+        ordering = ('sort',)
+
+    def __str__(self) -> str:
+        return self.name
+
+    def save(self, *args, **kwargs):
+        rv = super().save(*args, **kwargs)
+        Category.update_json()
+        return rv
+
+    @staticmethod
+    def update_json():
+        with open(settings.MEDIA_ROOT / 'categories.json', 'w') as fp:
+            json.dump(Category.asJson(), fp)
+
+    @staticmethod
+    def asJson() -> 'list[dict[str, str]]':
+        rv = []
+        for x in Category.objects.all():
+            rv.append({
+                'id': x.pk,
+                'name': x.name,
+                'color': x.color,
+                'inv': x.fg_color_white,
+            })
+        return rv
+
+
+@receiver(post_delete, sender=Category)
+def on_delete_Audiofile(sender, instance: 'Category', using, **kwargs):
+    Category.update_json()