utils: modelling: error message when both transformation function and default value...

After a discussion, we decided that this situation does not make any sense and we don't
know, how the program should behave. Therefore, we just disallow it.

diff --git a/manager/knot_resolver_manager/utils/modelling.py b/manager/knot_resolver_manager/utils/modelling.py
index f1b93dbd29e7c93e2e844d2bea5e1ff362836528..a8940fd3ffdcac0006f71633a15bdd2ba39be4dd 100644 (file)
--- a/manager/knot_resolver_manager/utils/modelling.py
+++ b/manager/knot_resolver_manager/utils/modelling.py
@@ -190,6 +190,10 @@ class SchemaNode:
             if val is not ...:
                 setattr(self, name, val)
                 used_keys.add(name)
+            
+                if hasattr(self, f"_{name}"):
+                    # check, that the schema makes sense
+                    raise TypeError(f"{cls.__name__}.{name}: can't have both default value and transformation function at once. Use _PREVIOUS_SCHEMA...")
 
         return used_keys