Django中PostgreSQL复合类型中的文件引发“无法适应类型'TemporaryUploadedFile'”

Question

我要保存文件，该文件位于PostgreSQL用户定义的复合字段中。保存不在自定义字段中的文件时，在save_form_data()中，setd属性变为FieldFile，这可能也是我想在复合字段中发生的情况。但是，当保存复合字段时，出现错误“无法适应类型'TemporaryUploadedFile'”，因为表示文件的元组元素保持TemporaryUploadedFile。如何在复合字段中保存文件？

这是我的合成字段（models.py）：

class MyType(models.Field):
    name_in_field = models.CharField(max_length=100)
    file_in_field = models.FileField(
        upload_to=file_path,
        storage=OverwriteStorage()
    )

    def db_type(self, connection):
        return "custom_field"

    def save_form_data(self, instance, data):
        # I want attribute to become tuple (CharField, FieldFile)
        # just like it happens with the file outside of MyType
        # but attribute becomes (CharField, TemporaryUploadedFile)
        # what is identical to data and throws error when saving
        # Default behavior:
        setattr(instance, self.name, data)
        # I suppose I should write something like below, but what exactly?
        # setattr(getattr(instance, self.name), "name_in_field", data[0])
        # setattr(getattr(instance, self.name), "file_in_field", data[1])

我已经准备好repo进行测试。