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Inserir várias imagens no mesmo registo no GridFS

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Na minha aplicação Django e mongodb estou a inserir fotos no gridfs do mongo.

Inserir apenas uma foto, num registo, tudo ok.

Agora quando quero inserir mais que uma, não estou a conseguir. Estou a definir como uma lista, mas dá erro.

Estou a tentar assim

class Painting(Document):
artist = StringField()
photo = ListField(FileField())
my_painting = Painting(artist='Steve')
my_painting.photo.append(open('C:/BD.JPG', 'r'))
Mas dá-me o seguinte erro: Validationerror('file' object has no attribute 'grid_id': ['photo'])

Alguém sabe o que estou a fazer mal?

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