[cleanup] Remove compatibility code for unsupported DRF versions

Author: ulgens

rest_framework_gis/apps.py

@@ -13,12 +13,7 @@ def ready(self):
 
         from .fields import GeometryField
 
-        try:
-            # drf 3.0
-            field_mapping = ModelSerializer._field_mapping.mapping
-        except AttributeError:
-            # drf 3.1
-            field_mapping = ModelSerializer.serializer_field_mapping
+        field_mapping = ModelSerializer.serializer_field_mapping
 
         # map GeoDjango fields to drf-gis GeometryField
         field_mapping.update(

tests/django_restframework_gis_tests/tests.py

@@ -18,8 +18,6 @@
 from .models import LocatedFile, Location, Nullable
 from .serializers import LocationGeoSerializer
 
-is_pre_drf_39 = not rest_framework.VERSION.startswith('3.9')
-
 
 class TestRestFrameworkGis(TestCase):
     def setUp(self):
@@ -526,7 +524,6 @@ def test_post_geojson_location_list_HTML_web_form_WKT(self):
         location = Location.objects.all()[0]
         self.assertEqual(location.name, "HTML test WKT")
 
-    @skipIf(is_pre_drf_39, 'Skip this test if DRF < 3.9')
     def test_geojson_HTML_widget_value(self):
         self._create_locations()
         response = self.client.get(
@@ -536,16 +533,6 @@ def test_geojson_HTML_widget_value(self):
         self.assertContains(response, '"type": "Point"')
         self.assertContains(response, '"coordinates": [')
 
-    @skipIf(not is_pre_drf_39, 'Skip this test if DRF >= 3.9')
-    def test_geojson_HTML_widget_value_pre_drf_39(self):
-        self._create_locations()
-        response = self.client.get(
-            self.geojson_location_list_url, headers={"accept": 'text/html'}
-        )
-        self.assertContains(response, '<textarea name="geometry"')
-        self.assertContains(response, '&quot;type&quot;: &quot;Point&quot;')
-        self.assertContains(response, '&quot;coordinates&quot;: [')
-
     def test_patch_geojson_location(self):
         location = Location.objects.create(
             name='geojson patch test', geometry='POINT (135.0 45.0)'