Django override model subclass create method

Question

I'm looking for right ways to override the create() method of a subclass.

Basically I'm doing this:

class Base(models.Model):
    field1_base = models.IntegerField()
    def __init__(self, field1_base):
        # LOGICS
        self.field1_base = field1_base

class A(Base):
    field2_sub = models.IntegerField()
    def __init__(self, field2_sub, field1_base):
        # LOGICS
        self.field2_sub = field2_sub
        super(A, self).__init__(field1_base)

A(field2_sub=1, field1_base=2)

However we can't override the __init__() method of a model.

I just want to leave some fields to be assigned in base class's methods.

Is there a proper way to do this using create() method?

Of course I can custom create method of Base class, however what I want is to invoke Base.create and A.create at the same time on the creation of A, which makes the situation different from this question

possible duplicate to stackoverflow.com/questions/39483184/… and stackoverflow.com/questions/843580/… — Sardorbek Imomaliev
– Sardorbek Imomaliev, Commented Sep 15, 2016 at 4:56
yup you can use a simple classmethod as explained in the answer — armak
– armak, Commented Sep 15, 2016 at 5:03
@SardorbekImomaliev Quite similar I think. However in my case I need to invoke the base model's methods at the same time. — SolessChong
– SolessChong, Commented Sep 15, 2016 at 5:18
I don't get it. Why not call super(A, self).create() then? Or you want to create Base and A objects at the same time with A.create()? — Sardorbek Imomaliev
– Sardorbek Imomaliev, Commented Sep 15, 2016 at 5:24
SardorbekImomaliev thank you for your answer. I want to split the logic into two parts, Base.create() and A.create(). How can I call both on the creation of instance of class A? — SolessChong
– SolessChong, Commented Sep 15, 2016 at 5:40

Sardorbek Imomaliev · Accepted Answer · 2016-09-15 05:44:27Z

1

I would do something like this.

class Base(models.Model):
    field1_base = models.IntegerField()

    def initialize(self, *args, **kwargs):
        self.field1_base = kwargs['field1_base']

    @classmethod
    def create(cls, *args, **kwargs):
        # LOGICS
        self = cls()
        self.initialize(*args, **kwargs)
        return self

class A(Base):
    field2_sub = models.IntegerField()

    def initialize(self, *args, **kwargs):
        super(A, self).initialize(*args, **kwargs)
        self.field2_sub = kwargs['field1_base']

A.create(field2_sub=1, field1_base=2)

answered Sep 15, 2016 at 5:44

Sardorbek Imomaliev

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1 Comment

SolessChong Over a year ago

It is a right answer, and actually I'm using the same work around. However I'm still looking for an elegant way of doing so. Thank you all the same.

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