如何在django模型中覆盖get方法？

问题描述

我想在将数据保存到数据库表之前对数据进行编码，并在从数据库表读取数据库表之后对其进行解码。我想覆盖django获取和保存方法。

I want to do encode the data before saving it to a database table and decode it after reading it from the database table. I wanted to override django get and save methods.

如下：

class UserData(models.Model):
    userid = models.IntegerFields
    data = models.charField(max_length=25)

    def save(self, *args, **kwargs):
        encode_data(self.data)
        super(UserData, self).save(*args, **kwargs)

    def get(self, *args, **kwargs):
        data = super(UserData, self).get(*args, **kwargs)
        return decode_data(data)

django模型有保存方法，我可以覆盖它，做我想要的。但是，他们似乎没有一个可以覆盖的get方法。
我该如何实现？
我希望在调用UserData.objects.all（）或UserData.objects.get（）或UserData.objects.filter（）或任何其他此类方法时可以解码数据

django models have save method and I am able to override it and do what i want. But, they doesnt seem to have a get method which I can override.How can I achieve this?I want the data to be decoded on calling UserData.objects.all() or UserData.objects.get() or UserData.objects.filter() or any other such methods available

推荐答案

通常，您可以通过覆盖 __ init __ 来实现。但是，由于Django Models上的 __ init __ 可以做各种好玩的事情，因此不建议您重写它。相反，请听 post_init 信号，然后在那里进行解码：

Usually, you do this by overriding __init__. But since __init__ on Django Models does all kind of funky business, it's not recommended to override it. Instead, listen for the post_init signal and do your decoding there:

def my_decoder(instance, **kwargs):
    instance.decoded_stuff = decode_this(instance.encoded.stuff)

models.signals.post_init.connect(my_decoder, UserData)

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