Prototype implementation

vergabe_teilnahme/apps/core/models.py

@@ -0,0 +1,106 @@
+from django.conf import settings
+from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
+from django.contrib.contenttypes.models import ContentType
+from django.db import models
+
+
+class EntityFieldConfig(models.Model):
+    entity_type = models.CharField(max_length=100)
+    field_name = models.CharField(max_length=100)
+    is_hidden = models.BooleanField(default=False)
+    display_label = models.CharField(max_length=200, blank=True)
+    sort_order = models.PositiveSmallIntegerField(default=0)
+
+    class Meta:
+        unique_together = ('entity_type', 'field_name')
+        verbose_name = 'Feldkonfiguration'
+        verbose_name_plural = 'Feldkonfigurationen'
+
+    def __str__(self):
+        return f'{self.entity_type}.{self.field_name}'
+
+
+class CustomAttribute(models.Model):
+    DATA_TYPE_CHOICES = [
+        ('text', 'Text'),
+        ('number', 'Zahl'),
+        ('date', 'Datum'),
+        ('boolean', 'Ja/Nein'),
+        ('url', 'URL'),
+        ('email', 'E-Mail'),
+    ]
+    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
+    object_id = models.PositiveIntegerField()
+    content_object = GenericForeignKey('content_type', 'object_id')
+    key = models.CharField(max_length=100)
+    label = models.CharField(max_length=200)
+    value = models.TextField(blank=True)
+    data_type = models.CharField(max_length=20, choices=DATA_TYPE_CHOICES, default='text')
+    sort_order = models.PositiveSmallIntegerField(default=0)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ['sort_order', 'created_at']
+        indexes = [models.Index(fields=['content_type', 'object_id'])]
+
+    def __str__(self):
+        return f'{self.label}: {self.value}'
+
+
+class Freigabe(models.Model):
+    TYP_CHOICES = [
+        ('teilnahme', 'Teilnahme-Freigabe'),
+        ('ablehnung', 'Ablehnungs-Freigabe'),
+        ('recht', 'Rechtliche Freigabe'),
+        ('preis', 'Preis-Freigabe'),
+        ('abgabe', 'Abgabe-Freigabe'),
+        ('standarddokument', 'Standarddokument-Freigabe'),
+        ('referenz', 'Referenz-Freigabe'),
+    ]
+    STATUS_CHOICES = [
+        ('erteilt', 'Erteilt'),
+        ('abgelehnt', 'Abgelehnt'),
+        ('ausstehend', 'Ausstehend'),
+    ]
+    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
+    object_id = models.PositiveIntegerField()
+    content_object = GenericForeignKey('content_type', 'object_id')
+    freigabe_typ = models.CharField(max_length=30, choices=TYP_CHOICES)
+    freigebende_person = models.ForeignKey(
+        settings.AUTH_USER_MODEL, on_delete=models.PROTECT, related_name='erteilte_freigaben'
+    )
+    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='erteilt')
+    kommentar = models.TextField(blank=True)
+    timestamp = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ['-timestamp']
+        verbose_name = 'Freigabe'
+        verbose_name_plural = 'Freigaben'
+
+    def __str__(self):
+        return f'{self.get_freigabe_typ_display()} — {self.status}'
+
+
+class FlexibleModel(models.Model):
+    custom_attributes = GenericRelation(CustomAttribute)
+    freigaben = GenericRelation(Freigabe)
+
+    def get_hidden_fields(self):
+        model_name = self._meta.model_name
+        return set(
+            EntityFieldConfig.objects.filter(
+                entity_type=model_name, is_hidden=True
+            ).values_list('field_name', flat=True)
+        )
+
+    def get_visible_field_names(self):
+        hidden = self.get_hidden_fields()
+        return [
+            f.name
+            for f in self._meta.get_fields()
+            if hasattr(f, 'column') and not f.name.startswith('_') and f.name not in hidden
+        ]
+
+    class Meta:
+        abstract = True