Fixed #25853 -- Added support for GeoHash function on SpatiaLite.

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

 """
 SQL functions reference lists:
 http://www.gaia-gis.it/spatialite-3.0.0-BETA/spatialite-sql-3.0.0.html
+https://web.archive.org/web/20130407175746/http://www.gaia-gis.it/gaia-sins/spatialite-sql-4.0.0.html
 http://www.gaia-gis.it/gaia-sins/spatialite-sql-4.2.1.html
 """
 import re
@@ -95,11 +96,13 @@ class SpatiaLiteOperations(BaseSpatialOperations, DatabaseOperations):
 
     @cached_property
     def unsupported_functions(self):
-        unsupported = {'BoundingCircle', 'ForceRHR', 'GeoHash', 'MemSize'}
+        unsupported = {'BoundingCircle', 'ForceRHR', 'MemSize'}
         if self.spatial_version < (3, 1, 0):
             unsupported.add('SnapToGrid')
         if self.spatial_version < (4, 0, 0):
             unsupported.update({'Perimeter', 'Reverse'})
+        elif not self.lwgeom_version():
+            unsupported.add('GeoHash')
         return unsupported
 
     @cached_property
@@ -212,6 +215,10 @@ class SpatiaLiteOperations(BaseSpatialOperations, DatabaseOperations):
         "Returns the version of the PROJ.4 library used by SpatiaLite."
         return self._get_spatialite_func('proj4_version()')
 
+    def lwgeom_version(self):
+        """Return the version of LWGEOM library used by SpatiaLite."""
+        return self._get_spatialite_func('lwgeom_version()')
+
     def spatialite_version(self):
         "Returns the SpatiaLite library version as a string."
         return self._get_spatialite_func('spatialite_version()')

docs/ref/contrib/gis/db-api.txt

@@ -316,7 +316,7 @@ Function                              PostGIS  Oracle  MySQL        SpatiaLite
 :class:`Distance`                     X        X       X (≥ 5.6.1)  X
 :class:`Envelope`                     X                X            X
 :class:`ForceRHR`                     X
-:class:`GeoHash`                      X
+:class:`GeoHash`                      X                             X (≥ 4.0, LWGEOM)
 :class:`Intersection`                 X        X       X (≥ 5.6.1)  X
 :class:`Length`                       X        X       X            X
 :class:`MemSize`                      X

docs/ref/contrib/gis/functions.txt

@@ -266,11 +266,15 @@ GeoHash
 
 .. class:: GeoHash(expression, **extra)
 
-*Availability*: PostGIS
+*Availability*: PostGIS, SpatiaLite (≥ 4.0, LWGEOM)
 
 Accepts a single geographic field or expression and returns a `GeoHash`__
 representation of the geometry.
 
+.. versionchanged:: 1.10
+
+    SpatiaLite support was added.
+
 __ https://en.wikipedia.org/wiki/Geohash
 
 Intersection

docs/releases/1.10.txt

@@ -80,7 +80,8 @@ Minor features
   and :attr:`~django.contrib.gis.gdal.GDALBand.std` attributes.
 
 * Added support for the :class:`~django.contrib.gis.db.models.MakeLine`
-  aggregate on SpatiaLite.
+  aggregate and :class:`~django.contrib.gis.db.models.functions.GeoHash`
+  function on SpatiaLite.
 
 * Added support for the
   :class:`~django.contrib.gis.db.models.functions.Difference`,