Added validation to BaseSpatialFeatures.has_<Func>_function.

django/contrib/gis/db/backends/base/features.py

@@ -2,6 +2,8 @@ import re
 
 from django.contrib.gis.db import models
 
+from .operations import BaseSpatialOperations
+
 
 class BaseSpatialFeatures:
     gis_enabled = True
@@ -107,5 +109,11 @@ class BaseSpatialFeatures:
         m = re.match(r"has_(\w*)_function$", name)
         if m:
             func_name = m[1]
+            if func_name not in BaseSpatialOperations.unsupported_functions:
+                raise ValueError(
+                    f"DatabaseFeatures.has_{func_name}_function isn't valid. "
+                    f'Is "{func_name}" missing from '
+                    "BaseSpatialOperations.unsupported_functions?"
+                )
             return func_name not in self.connection.ops.unsupported_functions
         raise AttributeError

django/contrib/gis/db/backends/base/operations.py

@@ -39,13 +39,17 @@ class BaseSpatialOperations:
         "AsGML",
         "AsKML",
         "AsSVG",
+        "AsWKB",
+        "AsWKT",
         "Azimuth",
         "BoundingCircle",
         "Centroid",
         "ClosestPoint",
         "Difference",
         "Distance",
+        "DistanceSpheroid",
         "Envelope",
+        "ForcePolygonCW",
         "FromWKB",
         "FromWKT",
         "GeoHash",