def __set__(self, instance, value):
        """Descriptor for assigning a value to a field in a document.
        """
        if isinstance(self.field, EmbeddedDocumentField) and:
            list_of_docs = list()
            for doc in value:
                if isinstance(doc, dict):
                    doc_obj = self.field.document_type_obj(**doc)
                    doc = doc_obj
                list_of_docs.append(doc)
            value = list_of_docs
        instance._data[self.field_name] = value