base of product-quota & list cities by province

apps/authentication/models.py

@@ -59,6 +59,12 @@ class Province(BaseModel):  # noqa
 
 class City(BaseModel):
     name = models.CharField(max_length=50)
+    province = models.ForeignKey(
+        Province,
+        on_delete=models.CASCADE,
+        related_name='cities',
+        null=True
+    )
 
     def __str__(self):
         return f'{self.name}'