Django模型：如何使用mixin类覆盖django模型的功能喜欢保存 [英] Django Model: How to use mixin class to override django model for function likes save

问题描述

我想在每个模型保存之前验证值。所以我必须覆盖保存功能。
代码几乎是一样的，我想把它写入一个mixin类。但是
失败我不知道如何写超级功能。

I want to validate value before every model save. So, I must override the save function. The code is nearly just the same on, and I want to write it in a mixin class. But failed for I don't know how to write super func.

我很不好意思，很抱歉。

I'm poor of of English, so sorry.

class SyncableMixin(object):
  def save(self, *args, **kwargs):
    try:
      res = validate(*args, **kwargs)
    except Exception:
      raise ValidateException()

    super(?, self).save(*args, **kwargs)

class SomeModel(SyncableMixin, models.Model):
  pass

推荐答案

你总是在超级调用中引用当前类。

You always refer to the current class in a super call.

super(SyncableMixin, self).save(*args, **kwargs)

对于mixins以及正常的子类化，这是正确的。

This is true for mixins as well as normal subclassing.

（另外，捕获一个基地异常，特别是不要只抓住东西来提高另一个异常 - 这根本就没有意义。）

(Also, don't catch a base Exception, and especially don't catch things only to raise another Exception - that makes no sense at all.)

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