Django：保存前修改模型的字段

Question

我有一个模型，当然，带有ImageField和FileField so I\xe2\x80\x99d like to create a folder each time the user create a course. I think I can do this before the model is saved so here is my question.

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如何访问方法中的 model\xe2\x80\x99s 字段？

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模型.py

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Class Course(models.Model):\n Thumbnail = model.ImageField(upload_to=\xe2\x80\x9c...\xe2\x80\x9d,...)\n\n    def save(self, *args, **kwargd):\n        ... #How can I alter here the ImageField parameters?\n        super().save(*args, **kwargs)\n

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Answer 1

请参阅此处有关获取模型字段的信息。

要获取对象实例的字段，那么它应该是

def save(self, *args, **kwargs):
     #### How can I alter here the ImageField parameters?
     self.Thumbnail = #do whatever you want here
     super().save(*args, **kwargs)

无法在方法中更改字段的参数。它只能在字段定义中完成，因为必须首先保存模型