#49 Parcels and Districts

* fixes bug in GeometryConflict conflict checking
* WIP: introduces new konova/utils/wfs/spatial holding SpatialWFSFetcher, which can be fed any geometry and it returns found features
* WIP: adds tests for wfs fetching
* updates requirements.txt

konova/models/geometry.py

@@ -21,6 +21,7 @@ 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
@@ -31,7 +32,7 @@ class Geometry(BaseResource):
 
         """
         # If no geometry is given or important data is missing, we can not perform any checks
-        if self.geom is None or (self.created is None and self.modified is None):
+        if self.geom is None:
             return None
 
         self.recheck_existing_conflicts()
@@ -43,7 +44,10 @@ class Geometry(BaseResource):
         ).distinct()
 
         for match in overlapping_geoms:
-            GeometryConflict.objects.get_or_create(conflicting_geometry=self, affected_geometry=match)
+            # Make sure this conflict is not already known but in a swapped constellation
+            conflict_exists_swapped = GeometryConflict.objects.filter(conflicting_geometry=match, affected_geometry=self).exists()
+            if not conflict_exists_swapped:
+                GeometryConflict.objects.get_or_create(conflicting_geometry=self, affected_geometry=match)
 
     def recheck_existing_conflicts(self):
         """ Rechecks GeometryConflict entries
@@ -88,6 +92,10 @@ class Geometry(BaseResource):
             objs += set_objs
         return objs
 
+    def update_parcels(self):
+        # ToDo
+        pass
+
 
 class GeometryConflict(UuidModel):
     """

konova/models/parcel.py

@@ -40,6 +40,7 @@ class Parcel(UuidModel):
         max_length=1000,
         help_text="Gemarkung"
     )
+    updated_on = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):
         return f"{self.gmrkng} | {self.flr} | {self.flrstck_nnr} | {self.flrstck_zhlr}"