Question

I have a parent class and a child class which inherits parent. In a child class object, I need to differentiate between parent class fields and child class fields.

Is this information available? If so, where. Need solution in Python, specifically Django.

Answer 1

Consider such a parent and child model:

class Parent(models.Model):
    parent_field = models.CharField(max_length=100)

class Child(Parent):
    child_field = models.CharField(max_length=100)

To make a function that determines if a field is defined in one of the parent, we should iterate over the class.__bases__, and try baseclass._meta.get_field for each

def is_attr_defined_on_parent(child, attr):
    for parent in child.__bases__:
        try:
            parent._meta.get_field(attr)
        except models.FieldDoesNotExist:
            continue
        else:
            return True
    return False

Now:

1. is_attr_defined_on_parent(Child, 'parent_field') returns True,

2. is_attr_defined_on_parent(Child, 'child_field') returns False.