Fixed #29116 -- Fixed OpenLayersWidget deserialization ignoring the widget map's SRID.

Regression in 6ecccad711.

django/contrib/gis/forms/fields.py

@@ -35,9 +35,14 @@ class GeometryField(forms.Field):
             return None
 
         if not isinstance(value, GEOSGeometry):
-            try:
-                value = GEOSGeometry(value)
-            except (GEOSException, ValueError, TypeError):
+            if hasattr(self.widget, 'deserialize'):
+                value = self.widget.deserialize(value)
+            else:
+                try:
+                    value = GEOSGeometry(value)
+                except (GEOSException, ValueError, TypeError):
+                    value = None
+            if value is None:
                 raise forms.ValidationError(self.error_messages['invalid_geom'], code='invalid_geom')
 
         # Try to set the srid

django/contrib/gis/forms/widgets.py

@@ -2,6 +2,7 @@ import logging
 
 from django.conf import settings
 from django.contrib.gis import gdal
+from django.contrib.gis.geometry import json_regex
 from django.contrib.gis.geos import GEOSException, GEOSGeometry
 from django.forms.widgets import Widget
 from django.utils import translation
@@ -36,7 +37,7 @@ class BaseGeometryWidget(Widget):
     def deserialize(self, value):
         try:
             return GEOSGeometry(value)
-        except (GEOSException, ValueError) as err:
+        except (GEOSException, ValueError, TypeError) as err:
             logger.error("Error creating geometry from value '%s' (%s)", value, err)
         return None
 
@@ -91,6 +92,13 @@ class OpenLayersWidget(BaseGeometryWidget):
     def serialize(self, value):
         return value.json if value else ''
 
+    def deserialize(self, value):
+        geom = super().deserialize(value)
+        # GeoJSON assumes WGS84 (4326). Use the map's SRID instead.
+        if geom and json_regex.match(value) and self.map_srid != 4326:
+            geom.srid = self.map_srid
+        return geom
+
 
 class OSMWidget(OpenLayersWidget):
     """

docs/releases/2.0.4.txt

@@ -29,3 +29,6 @@ Bugfixes
 * Fixed a regression in Django 1.11 where an empty choice could be initially
   selected for the ``SelectMultiple`` and ``CheckboxSelectMultiple`` widgets
   (:ticket:`29273`).
+
+* Fixed a regression in Django 2.0 where ``OpenLayersWidget`` deserialization
+  ignored the widget map's SRID and assumed 4326 (WGS84) (:ticket:`29116`).

tests/gis_tests/test_geoforms.py

@@ -1,7 +1,7 @@
 import re
 
 from django.contrib.gis import forms
-from django.contrib.gis.forms import BaseGeometryWidget
+from django.contrib.gis.forms import BaseGeometryWidget, OpenLayersWidget
 from django.contrib.gis.geos import GEOSGeometry
 from django.forms import ValidationError
 from django.test import SimpleTestCase, override_settings
@@ -31,8 +31,9 @@ class GeometryFieldTest(SimpleTestCase):
         fld = forms.GeometryField(srid=32140)
         tol = 0.0000001
         xform_geom = GEOSGeometry('POINT (951640.547328465 4219369.26171664)', srid=32140)
-        # The cleaned geometry should be transformed to 32140.
-        cleaned_geom = fld.clean('SRID=4326;POINT (-95.363151 29.763374)')
+        # The cleaned geometry is transformed to 32140 (the widget map_srid is 3857).
+        cleaned_geom = fld.clean('SRID=3857;POINT (-10615777.40976205 3473169.895707852)')
+        self.assertEqual(cleaned_geom.srid, 32140)
         self.assertTrue(xform_geom.equals_exact(cleaned_geom, tol))
 
     def test_null(self):
@@ -83,6 +84,11 @@ class GeometryFieldTest(SimpleTestCase):
                 with self.assertRaises(forms.ValidationError):
                     fld.to_python(wkt)
 
+    def test_to_python_different_map_srid(self):
+        f = forms.GeometryField(widget=OpenLayersWidget)
+        json = '{ "type": "Point", "coordinates": [ 5.0, 23.0 ] }'
+        self.assertEqual(GEOSGeometry('POINT(5 23)', srid=f.widget.map_srid), f.to_python(json))
+
     def test_field_with_text_widget(self):
         class PointForm(forms.Form):
             pt = forms.PointField(srid=4326, widget=forms.TextInput)
@@ -91,6 +97,8 @@ class GeometryFieldTest(SimpleTestCase):
         cleaned_pt = form.fields['pt'].clean('POINT(5 23)')
         self.assertEqual(cleaned_pt, GEOSGeometry('POINT(5 23)', srid=4326))
         self.assertEqual(4326, cleaned_pt.srid)
+        with self.assertRaisesMessage(ValidationError, 'Invalid geometry value.'):
+            form.fields['pt'].clean('POINT(5)')
 
         point = GEOSGeometry('SRID=4326;POINT(5 23)')
         form = PointForm(data={'pt': 'POINT(5 23)'}, initial={'pt': point})
@@ -132,8 +140,9 @@ class GeometryFieldTest(SimpleTestCase):
             ' rows="10" name="pt3"></textarea>',
             output
         )
-        # Only the invalid PNT(0) should trigger an error log entry
-        self.assertEqual(len(logger_calls), 1)
+        # Only the invalid PNT(0) triggers an error log entry.
+        # Deserialization is called in form clean and in widget rendering.
+        self.assertEqual(len(logger_calls), 2)
         self.assertEqual(
             logger_calls[0],
             "Error creating geometry from value 'PNT(0)' (String input "