def cursor_result(self, ordered_props):
compiled_cursor = datastore_pb.CompiledCursor()
position = compiled_cursor.add_position()
position.mutable_key().MergeFrom(self.key)
position.set_start_inclusive(False)
if self.prop_name in ordered_props:
index_value = position.add_indexvalue()
index_value.set_property(self.prop_name)
index_value.mutable_value().MergeFrom(self.value)
return compiled_cursor
def __init__(self, _cursor_pb=None):
"""Constructor.
A Cursor constructed with no arguments points the first result of any
query. If such a Cursor is used as an end_cursor no results will ever be
returned.
"""
if _cursor_pb is not None:
if not isinstance(_cursor_pb, datastore_pb.CompiledCursor):
raise datastore_errors.BadArgumentError(
'_cursor_pb argument should be datastore_pb.CompiledCursor (%r)' %
(_cursor_pb,))
self.__compiled_cursor = _cursor_pb
else:
self.__compiled_cursor = datastore_pb.CompiledCursor()
def from_bytes(cursor):
"""Gets a Cursor given its byte string serialized form.
The serialized form of a cursor may change in a non-backwards compatible
way. In this case cursors must be regenerated from a new Query request.
Args:
cursor: A serialized cursor as returned by .to_bytes.
Returns:
A Cursor.
Raises:
datastore_errors.BadValueError if the cursor argument does not represent a
serialized cursor.
"""
try:
cursor_pb = datastore_pb.CompiledCursor(cursor)
except (ValueError, TypeError), e:
raise datastore_errors.BadValueError(
'Invalid cursor %s. Details: %s' % (cursor, e))
def cursor_result(self, ordered_props):
compiled_cursor = datastore_pb.CompiledCursor()
position = compiled_cursor.add_position()
position.mutable_key().MergeFrom(self.key)
position.set_start_inclusive(False)
return compiled_cursor