滤波型号Django

Question

I have these models in my models.py:

class Category(models.Model):
    main_category= models.ForeignKey(HovedKategori, on_delete=models.CASCADE)
    name= models.CharField(max_length=200)

    def __str__(self):
        return self.name
    
class UnderCategori(models.Model):
    main_kategory= models.ForeignKey(Category, on_delete=models.CASCADE)
    supplier = models.CharField(max_length=200)
    price = models.IntegerField()
    title = models.CharField(max_length=200)
    img = models.CharField(max_length=200)
    info= models.CharField(max_length=200)
    link= models.CharField(max_length=200)


    def __str__(self):
        return str(self.supplier ) + " " + str(self.title)
    

Ho do i query all the different category suppliers without repeating them? What i mean is if i have 10 different suppliers with 500 products combined how do i query the 10 different suppliers. Also im not sure if this is the correct data stucture i should use, if there are any tips on that, that would also be appretiated.

Answer 1

I would suggest splitting the supplier from the category like so:

class Supplier(models.Model):
    name = models.CharField(max_length=200)

    def __str__(self):
        return self.name

class Category(models.Model):
    main_category = models.ForeignKey(HovedKategori, on_delete=models.CASCADE)
    name = models.CharField(max_length=200)

    def __str__(self):
        return self.name
    
class UnderCategori(models.Model):
    main_kategory= models.ForeignKey(Category, on_delete=models.CASCADE)
    supplier = models.ForeignKey(Supplier, on_delete=models.CASCADE)
    price = models.IntegerField()
    title = models.CharField(max_length=200)
    img = models.CharField(max_length=200)
    info= models.CharField(max_length=200)
    link= models.CharField(max_length=200)

    def __str__(self):
        return str(self.supplier ) + " " + str(self.title)

Then you could simply do Supplier.objects.all()
Please note that I don't really understand why there are two different categories. Perhaps one is a sub-category? Also, you are talking about products, not categories. I don't see any 'products' mentioned in your code