#18 File upload in certain folders

* removes document file folder if the last CompensationDocument is removed from a compensation

compensation/models.py

@@ -5,10 +5,12 @@ Contact: michel.peltriaux@sgdnord.rlp.de
 Created on: 17.11.20
 
 """
+import shutil
+
 from django.contrib.auth.models import User
 from django.contrib.gis.db import models
 from django.core.validators import MinValueValidator
-from django.db.models import Sum
+from django.db.models import Sum, QuerySet
 from django.utils.translation import gettext_lazy as _
 
 from codelist.models import KonovaCode
@@ -197,6 +199,17 @@ class Compensation(AbstractCompensation):
             y,
         )
 
+    def get_documents(self) -> QuerySet:
+        """ Getter for all documents of a compensation
+
+        Returns:
+            docs (QuerySet): The queryset of all documents
+        """
+        docs = CompensationDocument.objects.filter(
+            instance=self
+        )
+        return docs
+
 
 class CompensationDocument(AbstractDocument):
     """
@@ -212,6 +225,35 @@ class CompensationDocument(AbstractDocument):
         max_length=1000,
     )
 
+    def delete(self, *args, **kwargs):
+        """
+        Custom delete functionality for CompensationDocuments.
+        Removes the folder from the file system if there are no further documents for this entry.
+
+        Args:
+            *args ():
+            **kwargs ():
+
+        Returns:
+
+        """
+        comp_docs = self.instance.get_documents()
+
+        folder_path = None
+        if comp_docs.count() == 1:
+            # The only file left for this compensation is the one which is currently processed and will be deleted
+            # Make sure that the compensation folder itself is deleted as well, not only the file
+            # Therefore take the folder path from the file path
+            folder_path = self.file.path.split("/")[:-1]
+            folder_path = "/".join(folder_path)
+
+        # Remove the file itself
+        super().delete(*args, **kwargs)
+
+        # If a folder path has been set, we need to delete the whole folder!
+        if folder_path is not None:
+            shutil.rmtree(folder_path)
+
 
 class EcoAccount(AbstractCompensation):
     """