How to display an inlines relationship in a template?

Question

Django

There are two models, they are connected by a foreign key, they are displayed connected in the admin panel using inlines
How to output to the template in the same way as in the admin

panel models.py

class Order(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE,  blank=True, null=True, default = None, verbose_name='Пользователь')
    total_price = models.DecimalField(max_digits=10, decimal_places=2, default = 0, verbose_name='Сумма заказа')
    created = models.DateTimeField(auto_now_add=True, verbose_name='Дата добовления')
    status = models.ForeignKey(Status, on_delete=models.CASCADE, verbose_name='Статус')
    order = models.ForeignKey(Order, blank=True, on_delete=models.CASCADE, null=True,  verbose_name='Заказ')
    
    def __str__(self):
        return "Заказ %s %s" % (self.id, self.status.name)
    
    class Meta:
        verbose_name = 'Заказ'
        verbose_name_plural = 'Заказы'
        
    def save(self, *args, **kwargs):

        super(Order, self).save(*args, **kwargs)
        

class ProductsInOrder(models.Model):
    order = models.ForeignKey(Order, blank=True, on_delete=models.CASCADE, null=True,  verbose_name='Заказ')
    created = models.DateTimeField(auto_now_add=True, verbose_name='Дата добовления')
    product = models.ForeignKey(Product, blank=True, on_delete=models.CASCADE, null=True,  verbose_name='Товар')
    price_per_item = models.IntegerField(default = 1, verbose_name='Цена за одну штуку')
    quantity_nbr = models.IntegerField(default = 1, verbose_name='Количество')
    total_price = models.DecimalField(max_digits=10, decimal_places=2, default = 0, verbose_name='Общая сумма')
    is_active = models.BooleanField(default=True, verbose_name='Состояние')
    
    def __str__(self):
        return self.product.name

    class Meta:
        verbose_name = 'Товар в заказе'
        verbose_name_plural = 'Товары в заказе'
    
    def save(self, *args, **kwargs):
        price_per_item = self.product.price
        self.price_per_item = price_per_item
        print (self.quantity_nbr)

        self.total_price = int(self.quantity_nbr) * price_per_item

        super(ProductsInOrder, self).save(*args, **kwargs)

admin.py

class ProductsInOrder(admin.TabularInline):
    model = ProductsInOrder
    extra = 0
    can_delete = False
    max_num = 0
    readonly_fields = ('order', 'product', 'price_per_item', 'quantity_nbr', 'total_price', 'created')
    
    
@admin.register(Order)
class OrderAdmin(admin.ModelAdmin):
    list_display = ('id', 'user', 'total_price', 'status', 'created')
    readonly_fields = ('user','total_price', 'created')
    inlines = [
        ProductsInOrder,
    ]

Answer 1

order = models.ForeignKey(Order, blank=True, on_delete=models.CASCADE, null=True,  verbose_name='Заказ')

Add related_name, for example related_name='products_in_order'. Now, by calling Order, you can get all the related objects of the class ProductsInOrder (it should have been called ProductInOrder), something like this:
Order.products_in_order.all()
It remains to loop through and display the necessary data. If this is quite basic, it is still desirable to take care not to make unnecessary requests to the database, but that's another story))