[fix] Add schema generation support for plain GeometryFields #257

The intial implementation of schema generation only supported
serializers which subclassed GeoFeatureModel*Serializer. This meant that
models which have standalone GeometryFields would not properly generate
a schema. This change adds support for that use case.

Closes #257

rest_framework_gis/schema.py

@@ -4,7 +4,7 @@
 from rest_framework.schemas.openapi import AutoSchema
 from rest_framework.utils import model_meta
 
-from rest_framework_gis.fields import GeometrySerializerMethodField
+from rest_framework_gis.fields import GeometryField, GeometrySerializerMethodField
 from rest_framework_gis.serializers import (
     GeoFeatureModelListSerializer,
     GeoFeatureModelSerializer,
@@ -110,6 +110,12 @@ def map_field(self, field):
         if isinstance(field, GeoFeatureModelListSerializer):
             return self._map_geo_feature_model_list_serializer(field)
 
+        if isinstance(field, GeometryField):
+            return {
+                "type": "object",
+                "properties": self._map_geo_field(field.parent, field.field_name),
+            }
+
         return super().map_field(field)
 
     def _map_geo_feature_model_list_serializer(self, serializer):

tests/django_restframework_gis_tests/serializers.py

@@ -203,6 +203,12 @@ class Meta:
         fields = '__all__'
 
 
+class PolygonModelSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = PolygonModel
+        fields = '__all__'
+
+
 class MultiPolygonSerializer(gis_serializers.GeoFeatureModelSerializer):
     class Meta:
         model = MultiPolygonModel

tests/django_restframework_gis_tests/test_schema_generation.py

@@ -27,6 +27,7 @@
     GeojsonLocationContainedInBBoxList,
     GeojsonLocationContainedInTileList,
     GeojsonLocationWithinDistanceOfPointList,
+    ModelViewWithPolygon,
     geojson_location_list,
 )
 
@@ -608,3 +609,57 @@ def test_distance_to_point_filter(self):
                 },
             ],
         )
+
+    def test_geometry_field(self):
+        path = "/"
+        method = "GET"
+        view = create_view(ModelViewWithPolygon, "GET", create_request("/"))
+        inspector = GeoFeatureAutoSchema()
+        inspector.view = view
+        serializer = inspector.get_serializer(path, method)
+        content = inspector.map_serializer(serializer)
+
+        self.assertEqual(
+            content,
+            {
+                "type": "object",
+                "properties": {
+                    "id": {'type': 'integer', 'readOnly': True},
+                    'polygon': {
+                        'properties': {
+                            'coordinates': {
+                                'example': [
+                                    [0.0, 0.0],
+                                    [0.0, 50.0],
+                                    [50.0, 50.0],
+                                    [50.0, 0.0],
+                                    [0.0, 0.0],
+                                ],
+                                'items': {
+                                    'example': [[22.4707, 70.0577], [12.9721, 77.5933]],
+                                    'items': {
+                                        'example': [12.9721, 77.5933],
+                                        'items': {'format': 'float', 'type': 'number'},
+                                        'maxItems': 3,
+                                        'minItems': 2,
+                                        'type': 'array',
+                                    },
+                                    'minItems': 4,
+                                    'type': 'array',
+                                },
+                                'type': 'array',
+                            },
+                            'type': {'enum': ['Polygon'], 'type': 'string'},
+                        },
+                        'type': 'object',
+                    },
+                    "random_field1": {"type": "string", "maxLength": 32},
+                    "random_field2": {
+                        "type": "integer",
+                        "maximum": 2147483647,
+                        "minimum": -2147483648,
+                    },
+                },
+                "required": ["random_field1", "random_field2", "polygon"],
+            },
+        )

tests/django_restframework_gis_tests/views.py

@@ -11,7 +11,7 @@
 )
 from rest_framework_gis.pagination import GeoJsonPagination
 
-from .models import BoxedLocation, LocatedFile, Location, Nullable
+from .models import BoxedLocation, LocatedFile, Location, Nullable, PolygonModel
 from .serializers import (
     BoxedLocationGeoFeatureSerializer,
     LocatedFileGeoFeatureSerializer,
@@ -24,6 +24,7 @@
     LocationGeoSerializer,
     NoneGeoFeatureMethodSerializer,
     PaginatedLocationGeoSerializer,
+    PolygonModelSerializer,
 )
 
 
@@ -247,3 +248,8 @@ class GeojsonNullableDetails(generics.RetrieveUpdateDestroyAPIView):
 
 
 geojson_nullable_details = GeojsonNullableDetails.as_view()
+
+
+class ModelViewWithPolygon(generics.RetrieveUpdateDestroyAPIView):
+    model = PolygonModel
+    serializer_class = PolygonModelSerializer