如何使用方法更改类属性? [英] How to change class attributes using a method?

问题描述

我知道这可能是一个愚蠢的问题，但是我还没有找到解决方案.

我有一个具有一些默认属性的Django模型类，并且我想通过调用一个函数来更改complete变量的值:

  class目标(models.Model):文字= models.CharField(max_length = 500)日期= models.DateTimeField(auto_now = True)完成=错误def set_complete_true():完成=正确 

但是在调用set_complete_true()之后，完整变量仍然为False，不会更改.

提前谢谢！

解决方案

实例函数(大多数函数是实例函数)具有一个特殊参数，该参数始终是第一个一种叫做 self .它是对您用来调用该函数的对象的引用.例如，如果您调用 some_instance.foo()，则将 foo 与 some_instance 一起作为 self 来调用./p>

因此，您需要添加 self 参数，并将 self.complete 设置为 True :

  class目标(models.Model):文字= models.CharField(max_length = 500)日期= models.DateTimeField(auto_now = True)完成=错误def set_complete_true(自我):自我. complete = True  

I know this is maybe a dumb question but I haven't found a solution yet.

I have a Django model class who has some default attributes, and I want to change the value of the complete variable by calling a function:

class Goal(models.Model):
    text = models.CharField(max_length=500)
    date = models.DateTimeField(auto_now=True)
    complete = False

    def set_complete_true():
        complete = True

But after calling set_complete_true() the complete variable still False, doesn't change.

Thanks in advance!

解决方案

An instance function (most functions are instance functions) has a special parameter that is always the first one called self. It is a reference to the object with which you call the function. For example if you call some_instance.foo(), then foo is called with as self the some_instance.

You thus need to add the self parameter, and set the self.complete to True:

class Goal(models.Model):
    text = models.CharField(max_length=500)
    date = models.DateTimeField(auto_now=True)
    complete = False

    def set_complete_true(self):
        self.complete = True

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