python - MongoEngine schemata - name error -

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i have following schema in file called model.py

from mongoengine import *  class subject(document):     uri = stringfield(required=true)     resources = listfield(referencefield(resourcesubject))  class resourcesubject(document):     subject = referencefield(subject,reverse_delete_rule=cascade)     resource = referencefield(resource)  class resource(embeddeddocument):     uri = stringfield()     title = stringfield()     snippet = stringfield()     image = stringfield()     source = stringfield()     adapter = stringfield()

for reason when try initialize subject, subj = subject(uri="hello").save() getting name error : nameerror: name 'resourcesubject' not defined.

i cant understand reason, guess related framework? tried separating classes in individual files , importing, still same error. missing ?

the error thrown on line: resources = listfield(referencefield(resourcesubject))

put resourcesubject quotes:

resources = listfield(referencefield('resourcesubject'))

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