Unidirectional association

Hi all

I have created two classes. Instances of class A are timeless and instances of class B are different each year. Each instance of class B is associated with an instance of class A.

So I suppose I should do something like this

class A(models.Model):
    name = models.CharField(max_length=20, default = 'null')

class B(models.Model):
    A = models.ForeignKey('A', on_delete=models.CASCADE, related_name = "bs")
   
Now I need to declare three fields on class A that point to a different instance of class B for current, past and next year
    current_B
    previous_B
    next_B

I cannot find a way to declare such an association. Could you help me?

Thank you

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