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from django.contrib.gis.db.backends.base.features import BaseSpatialFeatures
from django.db.backends.sqlite3.features import \
DatabaseFeatures as SQLiteDatabaseFeatures
from django.utils.functional import cached_property
class DatabaseFeatures(BaseSpatialFeatures, SQLiteDatabaseFeatures):
supports_distance_geodetic = False
# SpatiaLite can only count vertices in LineStrings
supports_num_points_poly = False
@cached_property
def supports_initspatialmetadata_in_one_transaction(self):
# SpatiaLite 4.1+ support initializing all metadata in one transaction
# which can result in a significant performance improvement when
# creating the database.
return self.connection.ops.spatial_version >= (4, 1, 0)
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