[update]: model class methods

app/models/customer.py

@@ -11,6 +11,13 @@ class Customer(db.Model):
     created_at = db.Column(db.DateTime, default=datetime.utcnow)
     updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
+    @classmethod
+    def is_eligible(cls, customer_id):
+        customer = cls.query.filter_by(id=customer_id).first()
+        if not customer:
+            return False, "Customer not found"
+        return True, "Customer is eligible"
 
     def __repr__(self):
-        return f'<Customer {self.id}>'
+        return f'<Customer {self.id}>'
+