Django：int（）参数必须是字符串或数字，而不是'Plain'

Question

I have rather simple problem i guess. But i cant find a solution. It's been a while since i was writing in python/django...

My simple problem is, when im trying to add new Plain by admin interface.

TypeError: int() argument must be a string or a number, not 'Plain'

Site with form is rendering correctly, everything is fine till adding...

This is code of the models:

class Locomotion(models.Model):
    transportation_firm_name = models.CharField(max_length=200)
    transportation_number =  models.CharField(max_length=200)
    departure_date_time =  models.DateTimeField()
    arrival_date_time =  models.DateTimeField()

    class Meta:
        abstract = True

    def __str__(self):
        return self.transportation_name


class Plain(Locomotion):
    seat_number  = models.CharField(max_length=200)
    class_section =  models.CharField(max_length=200)

    def __init__(self, *args, **kwargs):
        super(Locomotion, self).__init__(self, *args, **kwargs)

    def __str__(self):
        return "plain"


class Train(Locomotion):
    seat_number  = models.CharField(max_length=200)
    section_numbers =  models.CharField(max_length=200)

    def __init__(self, *args, **kwargs):
        super(Locomotion, self).__init__(self, *args, **kwargs)

And the same is happening when im trying to add Train or any other element of class extending Locomotion.

Answer 1

When you call super , you don't need to pass self :

super(Plain, self).__init__(*args, **kwargs)

Also, note that usually, you want to call super passing the class that you are calling it from, Plain in this case.