I have a csv sheet I need to bulkload into AppEngine.
One of the fields is a list of integers of the form (eg) "1,2,3"; the
list can be empty.
I'm using the following import_transform function (where fn=int):
def parse_array(fn):
def wrapper(value):
return [fn(seg) for seg in re.split("\\,", value) if not
seg=='']
return wrapper
This barfs on bulkloading -
>> BadValueError: May not use the empty list as a property value; property
>> myarray is [].
OK, try again -
def parse_array(fn):
def wrapper(value):
if value == '' or value is None or value == []:
return None
return [fn(seg) for seg in re.split("\\,", value)]
return wrapper
This bulkloads fine; but if I try to load an entity with an empty list
field I get the following -
>> BadValueError: Property myarray must be a list
Can anyone suggest how empty db.ListProperty fields should be
initialised from bulkloader ?
Thanks.
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