Add support for prefetching fields
This makes it possible to specify the fields that should be
prefetched as part of a getForFields query. Doing a prefetch on a
ReferenceProperty when it is known that the property will be
referenced in (almost all) entities is far more efficient than
doing the invididual fetches sequentially.
"""
This module houses the GEOS exceptions, specifically, GEOSException and
GEOSGeometryIndexError.
"""
class GEOSException(Exception):
"The base GEOS exception, indicates a GEOS-related error."
pass
class GEOSIndexError(GEOSException, KeyError):
"""
This exception is raised when an invalid index is encountered, and has
the 'silent_variable_feature' attribute set to true. This ensures that
django's templates proceed to use the next lookup type gracefully when
an Exception is raised. Fixes ticket #4740.
"""
# "If, during the method lookup, a method raises an exception, the exception
# will be propagated, unless the exception has an attribute
# `silent_variable_failure` whose value is True." -- Django template docs.
silent_variable_failure = True