Django-在自定义模型函数中访问相关模型

Question

I have two models:

class ModelA(models.Model):
    b = models.ManyToManyField(ModelB, related_name = 'abs')

class ModelB(models.Model):
    x = models.IntegerField()

    def foo(self):
        self.abs.all() ...

I would like to access in the foo method of ModelB all the ModelA's in the ManyToMany relationship - I have tried this using the above but it says that 'abs' is not a field of ModelB. How can I fix this?

Many thanks

Answer 1

You are missing the return statement at foo method. Please change self.abs.all() by return self.abs.all() .

Answer 2

All what you need is:

class ModelA(models.Model):
    class Meta:
       app_label = 'app'
    b = models.ManyToManyField(ModelB, related_name='abs')

class ModelB(models.Model):
    class Meta:
       app_label = 'app'
    x = models.IntegerField()

    def foo(self):
       return self.abs.all()

I check this and its work.