give me a solution how manage parent node and child node in django through models

Django provides built-in support for managing parent-child relationships between models through its ORM (Object-Relational Mapping) system. Here's an example of how to define a parent-child relationship between two models in Django using models.py:

from django.db import models

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

class Child(models.Model):
    name = models.CharField(max_length=100)
    parent = models.ForeignKey(Parent, on_delete=models.CASCADE)

In this example, we have two models: Parent and Child. The Child model has a foreign key relationship with the Parent model, which means that each child belongs to a parent.

To create a new parent and child, you can do the following:

>>> parent = Parent.objects.create(name='John')
>>> child = Child.objects.create(name='Jane', parent=parent)

This will create a new parent object with the name 'John', and a new child object with the name 'Jane' and a foreign key reference to the parent object.

To access the child objects belonging to a parent object, you can use the related name of the foreign key field:

>>> parent.child_set.all()
<QuerySet [<Child: Child object (1)>]>

This will return a queryset containing all child objects that belong to the parent object.

You can also access the parent object from a child object:

>>> child.parent
<Parent: Parent object (1)>

This will return the parent object that the child object belongs to.

Overall, Django's built-in support for managing parent-child relationships between models makes it easy to handle hierarchical data structures in your application.