google app engine - How to find entries which has not empty StringListProperty? -

i have following model in google appengine app.

class testmodel(db.model):   names = db.stringlistproperty(required=false)

so, want entries has not empty in names property. tried this.

testmodel.all().filter('names !=', [])

but raises exception: badvalueerror: filtering on lists not supported

how can filter it? or should check 1 one following?

for entry in testmodel.all():   if len(entry.names) > 0:      result.append(entry)

try this:

testmodel.all().filter('names >=', none)

this give every entity @ least 1 value set names, i.e. every value in index.

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