La til funksjon Book.get_persons.
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@ -123,6 +123,11 @@ class Book(models.Model):
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authors.append(person.person)
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authors.append(person.person)
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return authors
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return authors
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def get_persons(self, relation):
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return map(lambda bp: bp.person,
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filter(lambda bp: bp.relation.name == relation,
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self.persons.all()))
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def __unicode__(self):
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def __unicode__(self):
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return self.title
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return self.title
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