Merge pull request '# Implements #332' (#323) from 332_Drop_deductions_of_deleted_intervention into master

Reviewed-on: SGD-Nord/konova#323

intervention/models/intervention.py

@@ -14,6 +14,7 @@ from django.urls import reverse
 from django.utils import timezone
 
 from analysis.settings import LKOMPVZVO_PUBLISH_DATE
+from compensation.models import EcoAccountDeduction
 from intervention.tasks import celery_export_to_egon
 from user.models import User
 from django.db import models, transaction
@@ -295,6 +296,27 @@ class Intervention(BaseObject,
             self.set_unchecked()
         return action
 
+    def mark_as_deleted(self, user, send_mail: bool = True):
+        """ Extends base mark_as_delete functionality
+
+        Removes related deductions from the database, which results in updating the deductable_rest of the
+        corresponding eco account.
+
+        Args:
+            user (User): The performing user
+            send_mail (bool): Whether to send an info mail
+
+        Returns:
+
+        """
+        super().mark_as_deleted(user, send_mail)
+
+        # Remove pending deductions to free booked capacities
+        deductions = self.deductions.all()
+        # Remove one by one instead of bulk to trigger EcoAccountDeduction custom delete() logic
+        for deduction in deductions:
+            deduction.delete()
+
     def set_status_messages(self, request: HttpRequest):
         """ Setter for different information that need to be rendered