Mail links

* adds direct object links into mail templates
* refactors transferring app-model identification data from fore- to background (celery) properly

intervention/models/intervention.py

@@ -18,6 +18,7 @@ from intervention.settings import INTERVENTION_IDENTIFIER_LENGTH, INTERVENTION_I
     INTERVENTION_LANIS_LAYER_NAME_RECORDED, INTERVENTION_LANIS_LAYER_NAME_UNRECORDED_OLD_ENTRY, \
     INTERVENTION_LANIS_LAYER_NAME_UNRECORDED
 from intervention.tasks import celery_export_to_egon
+from konova.sub_settings.django_settings import BASE_URL
 from user.models import User
 from django.db import models, transaction
 from django.db.models import QuerySet
@@ -69,6 +70,12 @@ class Intervention(BaseObject,
     def __str__(self):
         return f"{self.identifier} ({self.title})"
 
+    def get_detail_url(self):
+        return reverse("intervention:detail", args=(self.id,))
+
+    def get_detail_url_absolute(self):
+        return BASE_URL + self.get_detail_url()
+
     def save(self, *args, **kwargs):
         """ Custom save functionality