#49 Calculation implementation

* implements update routine for Geometry model
* reorganizes fields of Parcel and District
* adds tests
* simplifies usage of ParcelWFSFetcher

konova/models/geometry.py

@@ -7,8 +7,10 @@ Created on: 15.11.21
 """
 from django.contrib.gis.db.models import MultiPolygonField
 from django.db import models
+from django.utils import timezone
 
 from konova.models import BaseResource, UuidModel
+from konova.utils.wfs.spatial import ParcelWFSFetcher
 
 
 class Geometry(BaseResource):
@@ -21,7 +23,6 @@ class Geometry(BaseResource):
     def save(self, *args, **kwargs):
         super().save(*args, **kwargs)
         self.check_for_conflicts()
-        self.update_parcels()
 
     def check_for_conflicts(self):
         """ Checks for new geometry overlaps
@@ -93,8 +94,38 @@ class Geometry(BaseResource):
         return objs
 
     def update_parcels(self):
-        # ToDo
-        pass
+        """ Updates underlying parcel information
+
+        Returns:
+
+        """
+        from konova.models import Parcel, District
+        parcel_fetcher = ParcelWFSFetcher(
+            geometry_id=self.id,
+        )
+        typename = "ave:Flurstueck"
+        fetched_parcels = parcel_fetcher.get_features(
+            typename
+        )
+        underlying_parcels = []
+        for result in fetched_parcels:
+            fetched_parcel = result[typename]
+            parcel_obj = Parcel.objects.get_or_create(
+                flr=fetched_parcel["ave:flur"],
+                flrstck_nnr=fetched_parcel['ave:flstnrnen'],
+                flrstck_zhlr=fetched_parcel['ave:flstnrzae'],
+            )[0]
+            district = District.objects.get_or_create(
+                gmrkng=fetched_parcel["ave:gemarkung"],
+                gmnd=fetched_parcel["ave:gemeinde"],
+                krs=fetched_parcel["ave:kreis"],
+            )[0]
+            parcel_obj.district = district
+            parcel_obj.updated_on = timezone.now()
+            parcel_obj.save()
+            underlying_parcels.append(parcel_obj)
+
+        self.parcels.set(underlying_parcels)
 
 
 class GeometryConflict(UuidModel):