calculate remaining quota weight - product_id - change role permission serializer

apps/product/models.py

@@ -64,10 +64,22 @@ class Product(BaseModel):
         null=True
     )
 
+    def generate_product_id(self):  # noqa
+        """ generate id for product from 10 """
+
+        last = Product.objects.filter(product_id__gte=10, product_id__lte=1999).order_by('-product_id').first()
+        if last:
+            next_code = last.product_id + 1
+        else:
+            next_code = 10
+        return next_code
+
     def __str__(self):
         return f'name: {self.name} - type: {self.type}'
 
     def save(self, *args, **kwargs):
+        if not self.product_id:
+            self.product_id = self.generate_product_id()  # set product id
         super(Product, self).save(*args, **kwargs)