python - Workaround to return a list from a ComputedProperty function in NDB -

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python - Workaround to return a list from a ComputedProperty function in NDB -

i converting app utilize ndb. used have before:

@db.computedproperty def somecomputedproperty(self, indexed=false): if not self.somecondition: homecoming [] src = self.somereferenceproperty list = src.list1 + src.list2 + src.list3 + src.list4 \ + [src.str1, src.str2] homecoming map(lambda x:'' if not x else x.lower(), list)

as can see, method of generating list bit complicated, prefer maintain way. when started converting ndb, replaced @db.computedproperty @model.computedproperty got error:

notimplementederror: property somecomputedproperty not back upwards <type 'list'> types.

i see in model.py in ext.ndb computedproperty inherits genericproperty in _db_set_value there several if/else statements handle value according type, except there's no handling lists

currently goes through first status , gives out error when homecoming empty list.

is there way work around , avoid error?

you need set repeated=true flag computed property in ndb. don't think can utilize cute "@db.computedproperty" notation, you'll have say:

def _computevalue(self): ...same before... somecomputedproperty = computedproperty(_computevalue, repeated=true, indexed=false)

python google-app-engine gae-datastore python-2.7 app-engine-ndb

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