Add classmethod() extension utility to ExtensibleModel

aleksis/core/mixins.py

@@ -141,6 +141,12 @@ class ExtensibleModel(CRUDMixin):
 
         cls._safe_add(func, func.__name__)
 
+    @classmethod
+    def classmethod(cls, func: Callable[[], Any], name: Optional[str] = None) -> None:
+        """ Adds the passed callable as a classmethod. """
+
+        cls._safe_add(classmethod(func), func.__name__)
+
     @classmethod
     def field(cls, **kwargs) -> None:
         """ Adds the passed jsonstore field. Must be one of the fields in