Fixed #31142 -- Fixed MakeValid.output_field when geometry type is changed.

Regression in 2ef4b4795e.

django/contrib/gis/db/models/functions.py

@@ -376,7 +376,7 @@ class LineLocatePoint(GeoFunc):
     geom_param_pos = (0, 1)
 
 
-class MakeValid(GeoFunc):
+class MakeValid(GeomOutputGeoFunc):
     pass
 
 

tests/gis_tests/geoapp/test_functions.py

@@ -3,13 +3,13 @@ import math
 import re
 from decimal import Decimal
 
-from django.contrib.gis.db.models import functions
+from django.contrib.gis.db.models import GeometryField, PolygonField, functions
 from django.contrib.gis.geos import (
     GEOSGeometry, LineString, Point, Polygon, fromstr,
 )
 from django.contrib.gis.measure import Area
 from django.db import NotSupportedError, connection
-from django.db.models import Sum
+from django.db.models import Sum, Value
 from django.test import TestCase, skipUnlessDBFeature
 
 from ..utils import FuncTestMixin, mariadb, mysql, oracle, postgis, spatialite
@@ -348,6 +348,34 @@ class GISFunctionsTests(FuncTestMixin, TestCase):
         self.assertIs(invalid.repaired.valid, True)
         self.assertEqual(invalid.repaired, fromstr('POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))', srid=invalid.poly.srid))
 
+    @skipUnlessDBFeature('has_MakeValid_function')
+    def test_make_valid_multipolygon(self):
+        invalid_geom = fromstr(
+            'POLYGON((0 0, 0 1 , 1 1 , 1 0, 0 0), '
+            '(10 0, 10 1, 11 1, 11 0, 10 0))'
+        )
+        State.objects.create(name='invalid', poly=invalid_geom)
+        invalid = State.objects.filter(name='invalid').annotate(
+            repaired=functions.MakeValid('poly'),
+        ).get()
+        self.assertIs(invalid.repaired.valid, True)
+        self.assertEqual(invalid.repaired, fromstr(
+            'MULTIPOLYGON (((0 0, 0 1, 1 1, 1 0, 0 0)), '
+            '((10 0, 10 1, 11 1, 11 0, 10 0)))',
+            srid=invalid.poly.srid,
+        ))
+        self.assertEqual(len(invalid.repaired), 2)
+
+    @skipUnlessDBFeature('has_MakeValid_function')
+    def test_make_valid_output_field(self):
+        # output_field is GeometryField instance because different geometry
+        # types can be returned.
+        output_field = functions.MakeValid(
+            Value(Polygon(), PolygonField(srid=42)),
+        ).output_field
+        self.assertIs(output_field.__class__, GeometryField)
+        self.assertEqual(output_field.srid, 42)
+
     @skipUnlessDBFeature("has_MemSize_function")
     def test_memsize(self):
         ptown = City.objects.annotate(size=functions.MemSize('point')).get(name='Pueblo')