Initial commit from ZIP

evg-outbo-api/outbo/apps/projects/models/project_number.py

@@ -0,0 +1,26 @@
+from django.utils.translation import gettext_lazy as _
+
+from django.db import models
+from django.db.models import F
+
+from rules.contrib.models import RulesModel
+from outbo.apps.core.models import TimestampableDeletableMixin, SoftDeletableManager
+
+
+class ProjectNumberManager(SoftDeletableManager):
+    def get_next_number(self, prefix):
+        current = self.get_or_create(prefix=prefix)[0]
+        value = current.value
+
+        current.value = F("value") + 1
+        current.save()
+
+        return value
+
+
+class ProjectNumber(TimestampableDeletableMixin, RulesModel):
+    objects = ProjectNumberManager()
+    all_objects = ProjectNumberManager(alive_only=False)
+
+    prefix = models.CharField(max_length=4)
+    value = models.PositiveIntegerField(default=1)