Intervention Detail View

* adds hint for empty map in case of missing geometry
* adds empty geometry workaround, so openlayers is rendered without digitalization tools
* adds translations

konova/forms.py

@@ -10,7 +10,8 @@ from abc import abstractmethod
 
 from django import forms
 from django.contrib.auth.models import User
-from django.contrib.gis.forms import GeometryField, OSMWidget, MultiPolygonField
+from django.contrib.gis.forms import GeometryField, OSMWidget
+from django.contrib.gis.geos import Polygon
 from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
 
@@ -101,6 +102,8 @@ class SimpleGeomForm(BaseForm):
 
     """
     geom = GeometryField(
+        required=False,
+        disabled=True,
         widget=OSMWidget(
             attrs={
                 "map_width": 600,
@@ -110,15 +113,17 @@ class SimpleGeomForm(BaseForm):
     )
 
     def __init__(self, *args, **kwargs):
-        """
-        Constructor does not need to perform further initial setup, like other forms.
-        We simply use this here for easy rendering of a geometry view component
-
-        Args:
-            *args ():
-            **kwargs ():
-        """
         super().__init__(*args, **kwargs)
-        geom = self.instance.geometry.geom
+
+        # Initialize geometry
+        try:
+            geom = self.instance.geometry.geom
+            if geom is None:
+                raise AttributeError
+        except AttributeError:
+            # catches if no geometry has been added, yet. Replace with empty placeholder polygon.
+            geom = Polygon.from_bbox([0, 0, 0, 0])
+            # Zoom out to a very high level, so the user can see directly that there is no geometry for this entry
+            self.fields["geom"].widget.attrs["default_zoom"] = 1
         self.initialize_form_field("geom", geom)
-        self.disable_form_field("geom")
+        self.area = geom.area