Django如何访问抽象的Base模型局部变量 [英] Django how to access an abstract Base model local variables

问题描述

我已经定义了这个抽象的基本模型如下:

I have defined this abstract base model as below:

class ActivityAbstractBaseModel(models.Model):
    POOR = 'PR'
    FAIR = 'FA'
    MEDIOCRE = 'ME'
    GOOD_ENOUGH = 'GE'
    GOOD = 'GO'
    VERY_GOOD = 'VG'
    EXCELLENT = 'EX'

    STATE = [
        (POOR, 'Poor'),
        (FAIR, 'Fair'),
        (MEDIOCRE,'Mediocre' ),
        (GOOD_ENOUGH, 'Good Enough' ),
        (GOOD, 'Good'),
        (VERY_GOOD, 'Very Good'),
        (EXCELLENT, 'Excellent'),
    ]

    speaking = models.CharField(max_length=50, choices=STATE, default=GOOD)

然后我继承了这个抽象模型如下，并添加了新字段writing

I then inherit this abstract model as below and added the new field writing

class Fluency(ActivityAbstractBaseModel):
    writing = models.CharField(max_length=50, choices=STATE, default=GOOD)

现在，这个新字段 writing 正在尝试访问在抽象类中创建的变量 GOOD 和 STATE 但我有NameError 异常.有没有办法得到这些变量?

Now, this new field writing is trying to access the variable GOOD and STATE that was created in the abstract class but I am having the NameError exception. Is there a way to get these variables?

推荐答案

虽然您的类将继承这些类变量，但是您的代码不能在您定义类的地方直接引用它们(因为它们不存在于该范围内).相反，您可以在类声明中将它们称为 ActivityAbstractBaseModel.GOOD 等.

Although your class will inherit those class variables but the code you cannot directly refer them where you define your class (because they don't exist in that scope). Instead you can refer to them as ActivityAbstractBaseModel.GOOD, etc. inside your class declaration.

class Fluency(ActivityAbstractBaseModel):
    writing = models.CharField(max_length=50, choices=ActivityAbstractBaseModel.STATE, default=ActivityAbstractBaseModel.GOOD)

print(Fluency.GOOD) # This works properly

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