#49 Parcels and Districts

* introduces new models: Parcel and District

konova/models/__init__.py

@@ -9,3 +9,4 @@ from .object import *
 from .deadline import *
 from .document import *
 from .geometry import *
+from .parcel import *

konova/models/geometry.py

@@ -7,7 +7,6 @@ Created on: 15.11.21
 """
 from django.contrib.gis.db.models import MultiPolygonField
 from django.db import models
-from django.db.models import Q
 
 from konova.models import BaseResource, UuidModel
 
@@ -69,7 +68,6 @@ class Geometry(BaseResource):
         resolved_conflicts = all_conflicted_by_conflicts.exclude(id__in=still_conflicting_conflicts)
         resolved_conflicts.delete()
 
-
     def get_data_objects(self):
         """ Getter for all objects which are related to this geometry
 

konova/models/parcel.py

@@ -0,0 +1,70 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: michel.peltriaux@sgdnord.rlp.de
+Created on: 16.12.21
+
+"""
+from django.db import models
+
+from konova.models import UuidModel
+
+
+class Parcel(UuidModel):
+    """ The Parcel model holds administrative data on the covered properties.
+
+    Due to the unique but relevant naming of the administrative data, we have to use these namings as field
+    names in german. Any try to translate them to English result in strange or insufficient translations.
+
+    All fields have to be CharFields as well, since there are e.g. Flurstücksnummer holding e.g. '123____' which
+    can not be realized using numerical fields.
+
+    To avoid conflicts due to german Umlaute, the field names are shortened and vocals are dropped.
+
+    """
+    geometries = models.ManyToManyField("konova.Geometry", related_name="parcels", null=True, blank=True)
+    district = models.ForeignKey("konova.District", on_delete=models.SET_NULL, null=True, blank=True, related_name="parcels")
+    flrstck_nnr = models.CharField(
+        max_length=1000,
+        help_text="Flurstücksnenner"
+    )
+    flrstck_zhlr = models.CharField(
+        max_length=1000,
+        help_text="Flurstückszähler"
+    )
+    flr = models.CharField(
+        max_length=1000,
+        help_text="Flur"
+    )
+    gmrkng = models.CharField(
+        max_length=1000,
+        help_text="Gemarkung"
+    )
+
+    def __str__(self):
+        return f"{self.gmrkng} | {self.flr} | {self.flrstck_nnr} | {self.flrstck_zhlr}"
+
+
+class District(UuidModel):
+    """ The model District holds more coarse information, such as Kreis, Verbandsgemeinde and Gemeinde.
+
+    There might be the case that a geometry lies on a hundred Parcel entries but only on one District entry.
+    Therefore a geometry can have a lot of relations to Parcel entries but only a few or only a single one to one
+    District.
+
+    """
+    gmnd = models.CharField(
+        max_length=1000,
+        help_text="Gemeinde"
+    )
+    vg = models.CharField(
+        max_length=1000,
+        help_text="Verbandsgemeinde",
+    )
+    krs = models.CharField(
+        max_length=1000,
+        help_text="Kreis"
+    )
+
+    def __str__(self):
+        return f"{self.krs} | {self.vg} | {self.gmnd}"