Fixed #23966: Adds SELECT InitSpatialMetaData(); query execution

django/contrib/gis/apps.py

@@ -1,8 +1,15 @@
+import sys
+
 from django.apps import AppConfig
 from django.core import serializers
 
 from django.utils.translation import ugettext_lazy as _
 
+from django.core.exceptions import ImproperlyConfigured
+from django.utils import six
+from django.db import connections
+from django.contrib.gis.db.backends.spatialite.base import DatabaseWrapper as SpatialiteDatabaseWrapper
+
 
 class GISConfig(AppConfig):
     name = 'django.contrib.gis'
@@ -11,3 +18,20 @@ class GISConfig(AppConfig):
     def ready(self):
         if 'geojson' not in serializers.BUILTIN_SERIALIZERS:
             serializers.BUILTIN_SERIALIZERS['geojson'] = "django.contrib.gis.serializers.geojson"
+
+        # Workaround for SpatiaLite: If a SpatiaLite database file doesn't
+        # exist during migration, it will be created automatically. But in
+        # that case, it doesn't have spatial metadata tables, so needs to be
+        # initialized before migration.
+        for conn in connections.all():
+            if type(conn) == SpatialiteDatabaseWrapper:
+                try:
+                    cur = conn.cursor()
+                    r = cur.execute("SELECT count(*) FROM sqlite_master WHERE type='table' AND name='spatial_ref_sys';")
+                    if r.next()[0] == 0:
+                        cur.execute("SELECT InitSpatialMetaData();")
+                except Exception as msg:
+                    new_msg = (
+                        'An exception occurs during initializing spatial metadata: '
+                        '%s') % (msg)
+                    six.reraise(ImproperlyConfigured, ImproperlyConfigured(new_msg), sys.exc_info()[2])