Set User's stringification

utils/models.py

@@ -3,4 +3,11 @@ from django.contrib.auth.models import AbstractUser
 
 # https://docs.djangoproject.com/en/3.1/topics/auth/customizing/#using-a-custom-user-model-when-starting-a-project
 class MyUser(AbstractUser):
-	pass
+	
+	def __str__(self):
+		if self.first_name != '' and self.last_name != '':
+			return f"{self.first_name} {self.last_name}"
+		# Hack: if a nickname is to be used, it is the first name.
+		if self.first_name != '':
+			return self.first_name
+		return self.username