Update created_at

Add the auto_now_add attribute

Author: Benbb96

function_views/models.py

@@ -13,12 +13,12 @@ class User(models.Model):
     instagram_profile = models.URLField(null=True)
     avatar = models.CharField(max_length=250, null=True)
     website = models.URLField()
-    created_at = models.DateTimeField()
+    created_at = models.DateTimeField(auto_now_add=True)
 
 
 class Message(models.Model):
     """Message left by a user in a guest book."""
     id = models.AutoField(primary_key=True)
     name = models.CharField(max_length=255)
     message = models.TextField()
-    created_at = models.DateTimeField()
+    created_at = models.DateTimeField(auto_now_add=True)