django add parents to field - django

Question

I have a Product model that has a ManyToMany to Category.
Category has a ForeignKey to itself named parent.
I want to add all parents of selected category to category field.
example for category:
digital appliance->None __ Mobile->digital appliance __ Samsung->Mobile and...
when choose Samsung for category of a product, I want to add Mobile and digital appliance to category
it's my models, the save method doesn't do anything
Class Product:
class Product(models.Model):
STATUS_CHOICES = (
('s', 'show'),
('h', 'hide'),
)
title = models.CharField(max_length=150)
slug = models.SlugField(max_length=170, unique=True)
category = models.ManyToManyField(Category)
thumbnail = models.ImageField(upload_to='images/products', default='images/no-image-available.png')
image_list = ImageSpecField(source='thumbnail', processors=[ResizeToFill(400, 200)], format='JPEG',options={'quality': 75})
image_detail = ImageSpecField(source='thumbnail', processors=[ResizeToFill(1000, 500)], format='JPEG',options={'quality': 100})
description = models.TextField()
inventory = models.IntegerField()
features = models.ManyToManyField(Feature)
status = models.CharField(max_length=1, choices=STATUS_CHOICES, default='s')
def __str__(self):
return self.title
class Meta:
verbose_name = "product"
verbose_name_plural = "products"
def save(self, *args, **kwargs):
for cat in self.category.all():
if cat.parent:
self.category.add(cat.parent)
return super(Product, self).save(*args, **kwargs)
objects = ProductManager()
Category and CategoryManager:
class CategoryManager(models.Manager):
def no_parent(self):
return self.filter(parent=None)
def get_parent(self, parent):
return self.filter(parent=parent)
class Category(models.Model):
parent = models.ForeignKey('self', default=None, null=True, blank=True, on_delete=models.SET_NULL,related_name='children')
title = models.CharField(max_length=40)
slug = models.SlugField()
status = models.BooleanField(default=True)

Answer 1

I think it makes more sense to have Foreign Key to category table rather than m2m relation. You can flatten it in the view whenever needed